Diesel Extreme

Rated 4.90 out of 5 based on 125 customer ratings
(103 customer reviews)

$11.95$222.95

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SAVE 10%: Buy multiples of (6) 2QT or 1 GAL OR (12) 1QT or 16OZ.

FREE SHIPPING on every order (Contiguous US)

FREE with ALL orders Tax Refund Sale! Every order over $35 receives a FREE 32 oz bottle of Diesel Extreme $17 Value.

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Restore Your Original Performance Power!

Restores throttle response
Eliminates black smoke & improves cold starting
Reduces DPF regeneration cycles up to 50%
Cleans injector tips, cylinders, fuel lines & tank
Increases mileage & eliminates stiction from the fuel system

Recommended for ALL diesel engines. NOT for use in gasoline vehicles.

TREATMENT RATIO
4 OZ / 10 GAL
8 OZ / 20 GAL
32 OZ / 80 GAL
SKU: P0404 Category:

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4.9 out of 5 stars

103 reviews

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What others are saying

  1. Kevin

    Cummins N14

    Kevin

    I was wondering if this product works as good inbig tractors as well as it does in a regular diesel

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    • Levi

      Levi (verified owner)

      Yes absolutely Kevin!

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  2. thehm2

    FR3

    thehm2

    This product seamed to help in diesel engines,
    also used in hydraulic pumps and systems on tractors.

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    • Levi

      Levi (verified owner)

      Thanks, keep us posted!

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  3. john

    Considering...

    john

    Have acquaintances who like the product, but no parameter measurements. 1. In what would you expect to measure improvements and what percentage?
    2. Is EDT just a weaker solution of H.S. Diesel Extreme? I ask his because of this answer in the comments section: ” Hi Steve, we don’t recommend using the full dose for more than 2-3 tankfuls every 6 months/6,000 miles. If you do want to use Diesel Extreme every tank, only 1-2 ounces is necessary, thanks!” Thank you. John

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    • Gad

      Gad

      Can u use this product in gas engines?

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    • Levi

      Levi (verified owner)

      No, absolutely not, as the cetane boost has a negative affect on gasoline octane rating. Thanks!

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    • Levi

      Levi (verified owner)

      Hi John, the biggest improvements are reduced black smoke, regen cycles (up to 50% less), and (measurable) fuel economy. We can’t guarantee a percentage based on individual vehicle mileage, pre-existing issues, and driving style. Hope that helps!

      The EDT is actually a more economical lubricant & cetane boost formula. It will keep-clean while the Diesel Extreme has much higher deep-clean properties.

      (Horsepower/torque improvements should also be measurable if you have access to a dynomometer, etc.)

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  4. Todd LaMantia

    Diesel additive

    Todd LaMantia

    This is the only additive I will use, its easy and makes a difference in performance that you can actually feel in your trucks performance

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    • Levi

      Levi (verified owner)

      Thanks Todd!

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    • Toby S.

      Toby S.

      Which of your oils do you recommend for
      2011 Chevy Duramax

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    • Levi

      Levi (verified owner)

      Hi Toby, if you want to use the best diesel oil available, the 5w40 PAO CK4 is a great option for extended oil changes and engine life.

      The 15w40 PAO CK4 is also a good choice if you wish to stick to manufacturer specs and don’t live in extreme cold climates, thanks!

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  5. Matt

    Matt

    has there been any luck with using this on a GM 6.6 LB7?

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    • Levi

      Levi (verified owner)

      Yes absolutely! If you’re not satisfied, we’ll give you your money back.

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  6. Gary Iwane

    Gary Iwane

    Used your product in my 03 Duramax and Volvo diesel in my boat. Very pleased with throttle response and smooth running. Will be ordering Stiction Eliminator next

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    • Levi

      Levi (verified owner)

      Thanks Gary, keep us posted!

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  7. Joe

    Joe

    I bought my first diesel 3 years ago (o6 Duramax LBY). I’ve used Extreme to clean the fuel system and EDT every fill up. Never had an issue with the fuel system and it still runs like a top 40,000 mile later. I used stiction eliminator in the block and it did what I expected. Better power and booster fuel economy by about 10% (could be EDT, not sure. Just know it runs better and fuel economy is better). I used TSE in the Allison and it does run cooler by about 10 degrees, but I didn’t notice much of a smoother shift pattern(it was already pretty smooth anyway). Love the products and will continue using them. Have turned several friends onto it and they also love it. With Hot Shot’s Secret, my retirement truck may outlive me.

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    • Levi

      Levi (verified owner)

      Thanks so much Joe!

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    • Lloyd

      Lloyd

      Will it help my 03 6.6 quit white smoke when idle

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    • Levi

      Levi (verified owner)

      Yes, highly likely it will help…or your money back!

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  8. Raymond Thomas

    Question

    Raymond Thomas

    Hello, I have a question about your Diesel Extreme product. I own a 2009 Ford F-350 with a 6.4 Powerstroke with 85,000 miles.Purchased in 2012 with 77,000 miles. All original with DPF in place. Of course these trucks have the worst regen system of any other engine so, I am always looking for any type of preventive measure to keep from spending repair money. I have always used a cetane boost product since owning and for the past couple of years also use an oil additive with every oil change.. I currently use not one but, two fuel additives. One for the cetane boost rating and one for the lubricity, storing ability and water dispersant quality. They are from two different manufactures. I contacted the one manufacture and they stated, using the two in conjunction was not an issue but, was indeed a good thing. In reading some of your comments you guys discourage from mixing additives. So, first is mixing the two fuel additives a bad thing? Second, I was interested in the cleaning ability and reduction of regens of your product. Would your product benefit my application in addition to measures already being taken or am I probably already doing about all you can? Keep in mind as well, my truck does a lot of sitting. Really used only about 2-3 times a year to pull 5th camper. Truck is cranked and moved on a regular basis. Also, if I used your product would my fuel filter need to be changed after application? Getting ready to do annual service on truck. Thanks

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    • Levi

      Levi (verified owner)

      Hi Raymond, first of all, mixing two fuel additives is less of a risk than mixing two oil additives, as long as following recommended dosage and intervals. The Diesel Extreme is 10x stronger than the average diesel fuel additive and will help with cleaning, lubricity and long term storage & water dispersant. In your case use once a year. Only in severe cases will the fuel filter need to be changed (and depending on how new it is).

      When you do drive the truck/camper, consider using our EDT fuel additive for additional cetane boost and lubricity!

      Here is the full report where Diesel Extreme reduced regens 50%! https://www.hotshotsecret.com/wp-content/uploads/2016/04/LSI-08Freightliner_6.7L.pdf

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  9. Brandon

    Brandon

    If I have a half tank of fuel in my 7.3 with power service anti gel, can I fill the tank and put the diesel extreme in without hurting anything? Have a 250 mile trip tomorrow and want to run the diesel extreme.

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  10. Brandon

    Question

    Brandon

    If I have a half tank of fuel in my 7.3 with power service anti gel, can I fill the tank and put the diesel extreme in without hurting anything? Have a 250 mile trip tomorrow and want to run the diesel extreme.

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    • Levi

      Levi (verified owner)

      Usually we recommend not mixing additives, but in this case you are perfectly safe. PS Next time give our Anti-Gel a try…thanks Brandon!

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  11. Steve Waclo

    Steve Waclo

    When these engines begin to smoke at idle, it’s what police call a “clue” and time for new injectors. Mine is smoking on the second set at 155k and a variety of products, including GM injector cleaner several times, have had minimal effect. Diesel Extreme is my final effort to avoid a multi-thousand dollar repair and it’s hard to be optimistic. Half a gallon of product so far and smoke at idle continues…Hard to guess at a star rating but I’ll go with 4, since I don’t want to lower the rating for a problem that no product is likely to fix.

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  12. Steve Waclo

    4 out of 5 '03 Duramax, LB7

    Steve Waclo (verified owner)

    When these engines begin to smoke at idle, it’s what police call a “clue” and time for new injectors. Mine is smoking on the second set at 155k and a variety of products, including GM injector cleaner several times, have had minimal effect. Diesel Extreme is my final effort to avoid a multi-thousand dollar repair and it’s hard to be optimistic. Half a gallon of product so far and smoke at idle continues…Hard to guess at a star rating but I’ll go with 4, since I don’t want to lower the rating for a problem that no product is likely to fix.

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  13. Duane Shaw

    Duane Shaw

    I have a exhaust particulate filter warning on my 2010 BMW X5 Diesel. Which product will best help maintain or clean that filter. The vehicle has 100k miles and is well maintained over the years. I have never used an additive in the past.

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  14. Duane Shaw

    Question

    Duane Shaw

    I have a exhaust particulate filter warning on my 2010 BMW X5 Diesel. Which product will best help maintain or clean that filter. The vehicle has 100k miles and is well maintained over the years. I have never used an additive in the past.

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    • Levi

      Levi (verified owner)

      Hi Duane, the combination of Diesel Extreme to initially clean and EDT for every tank after that, has been proven to reduce regen cycles by up to 50%!

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  15. Chris Garner

    Chris Garner

    I am looking to buy a 2006 cummins 5.9 and on the test drive I notice a little rough idle and when I pulled of the parking lot white smoke was coming out of the exhaust but it cleared up after driving it.What do you recommend

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  16. Chris Garner

    Question

    Chris Garner

    I am looking to buy a 2006 cummins 5.9 and on the test drive I notice a little rough idle and when I pulled of the parking lot white smoke was coming out of the exhaust but it cleared up after driving it.What do you recommend

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    • Levi

      Levi (verified owner)

      Hi Chris, especially since the smoke cleared up, you are definitely on the right track with Diesel Extreme…thanks!

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  17. Terry Lape

    Question

    Terry Lape

    Does Diesel Extreme contain alcohol?

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    • Richard Altans

      Richard Altans

      Question – Is this recommended for Boat Diesel?

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    • Levi

      Levi (verified owner)

      Yes absolutely Richard!

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    • Levi

      Levi (verified owner)

      No it does not, thanks!

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  18. dennis33

    dennis33

    Added Diesel Extreme to a full tank on my 2005 6.0 Powerstroke. Easier starting, smooth idle, can recommend this product!

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  19. dennis33

    5 out of 5 Running Smooth!

    dennis33 (verified owner)

    Added Diesel Extreme to a full tank on my 2005 6.0 Powerstroke. Easier starting, smooth idle, can recommend this product!

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  20. Douglas Dikun

    Douglas Dikun

    I remember reading somewhere, that one of your products is very beneficial to stroke engines. I have a chainsaw that seems to be getting gummed up. A little marvel mystery oil in the fuel oil mix has helped but doesn’t last past the next fuel up.
    #2 when will the FR3 be back in stock?

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  21. Douglas Dikun

    Question

    Douglas Dikun

    I remember reading somewhere, that one of your products is very beneficial to stroke engines. I have a chainsaw that seems to be getting gummed up. A little marvel mystery oil in the fuel oil mix has helped but doesn’t last past the next fuel up.
    #2 when will the FR3 be back in stock?

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    • Levi

      Levi (verified owner)

      FR3 Friction Reducer is a good product to start with, it is fully back in stock now Douglas!

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  22. Ben

    Ben

    How would this work in a 2004 Cummins for cleaning injectiors?

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  23. Ben

    Question

    Ben

    How would this work in a 2004 Cummins for cleaning injectiors?

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    • Levi

      Levi (verified owner)

      We guarantee it will clean the injectors in your Cummins, or your money back!

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  24. Thomas Gwin

    Thomas Gwin

    I’ve been using this product in my Pete 387 since pilot/flying j started carrying it. Now I use it in my 16 duramax and farm tractors as well, it’s always been a great product and best bang for your buck

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  25. Thomas Gwin

    5 out of 5 Great product

    Thomas Gwin

    I’ve been using this product in my Pete 387 since pilot/flying j started carrying it. Now I use it in my 16 duramax and farm tractors as well, it’s always been a great product and best bang for your buck

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  26. Daran Mercury

    Daran Mercury

    Two questions:
    1. How long is an opened bottle of Diesel Extreme good for?
    2. Is Diesel Extreme compatibly with Propel HPR renewable diesel?

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  27. Daran Mercury

    Question

    Daran Mercury

    Two questions:
    1. How long is an opened bottle of Diesel Extreme good for?
    2. Is Diesel Extreme compatibly with Propel HPR renewable diesel?

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    • Levi

      Levi (verified owner)

      Typically, we’d recommend using our products within 4-5 years. Yes it is definitely compatible with Propel HPR renewable diesel!

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  28. Timothy Smith

    Timothy Smith

    Who this product be recommended for Peterbilts (Sleepers) as well?

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  29. Timothy Smith

    Question

    Timothy Smith

    Who this product be recommended for Peterbilts (Sleepers) as well?

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    • Levi

      Levi (verified owner)

      Yes absolutely!

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  30. Chuck Wideen

    Chuck Wideen

    On my first trip out after adding Diesel Extreme I could feel the performance difference. My Cat 350 is running so smoothly. The mileage in my motorhome actually went up by 1.5 mpg, even over a stretch that usually produces very poor mileage. I will be adding the Stiction Eliminator on my next oil change.

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  31. Chuck Wideen

    Just as advertised

    Chuck Wideen (verified owner)

    On my first trip out after adding Diesel Extreme I could feel the performance difference. My Cat 350 is running so smoothly. The mileage in my motorhome actually went up by 1.5 mpg, even over a stretch that usually produces very poor mileage. I will be adding the Stiction Eliminator on my next oil change.

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  32. Michael Arreola

    Michael Arreola

    Been using this product for the last year and really like this product going to start using EDT keep making this thanks

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  33. Michael Arreola

    4 out of 5 Good stuff

    Michael Arreola (verified owner)

    Been using this product for the last year and really like this product going to start using EDT keep making this thanks

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  34. Christopher

    Christopher

    On my duramax 06 lbz the egr code would come up every so often without additives so I’d run 30 dollars or so of other additives to get it to clear out codes. That’s about 3 tanks of fuel but with the diesel extreme used as recommended and it cleared codes almost right away and hasn’t been back. The truck is running smoother than ever. I’m going use the other hotshot products and see how they work.

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  35. Christopher

    DTS code killer!

    Christopher (verified owner)

    On my duramax 06 lbz the egr code would come up every so often without additives so I’d run 30 dollars or so of other additives to get it to clear out codes. That’s about 3 tanks of fuel but with the diesel extreme used as recommended and it cleared codes almost right away and hasn’t been back. The truck is running smoother than ever. I’m going use the other hotshot products and see how they work.

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  36. Ben Day

    Ben Day

    I add this preventatively every oil change, haven’t had any problems.

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  37. Ben Day

    5 out of 5 Runs good

    Ben Day (verified owner)

    I add this preventatively every oil change, haven’t had any problems.

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  38. Paul

    Paul

    My fuel and filter are turning green. can your product clean this up.

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  39. Paul

    Question

    Paul

    My fuel and filter are turning green. can your product clean this up.

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    • Levi

      Levi (verified owner)

      Hi Paul it is definitely worth a try. This is at least twice as strong as the next best fuel additive on the market. If it doesn’t work, we will give you you’re money back, and at that point give us a call to ask about our Microbicide specialty product, thanks!

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  40. Chris Karlin

    Chris Karlin

    I trust that Diesel Extreme is great. I didn’t notice much difference when I first used it but I will continue using it every 6,000 miles on my deleted/tuned 2011 BMW 335d. The product that I have truly noticed a huge difference from is EDT which reduced my black smoke by about 90%. It reduced how often it smokes and the opacity of the smoke. I will keep using Diesel Extreme and EDT for sure!

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  41. Chris Karlin

    5 out of 5

    Chris Karlin (verified owner)

    I trust that Diesel Extreme is great. I didn’t notice much difference when I first used it but I will continue using it every 6,000 miles on my deleted/tuned 2011 BMW 335d. The product that I have truly noticed a huge difference from is EDT which reduced my black smoke by about 90%. It reduced how often it smokes and the opacity of the smoke. I will keep using Diesel Extreme and EDT for sure!

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  42. Michael

    Michael

    Have used Power Service products in the past. This has reduced black smoke and has increased my milage. Currently using EDT and will be using Stiction Eliminator with my next oil change.

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  43. Michael

    5 out of 5 VW Jetta with 210,00 miles

    Michael (verified owner)

    Have used Power Service products in the past. This has reduced black smoke and has increased my milage. Currently using EDT and will be using Stiction Eliminator with my next oil change.

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  44. keith reimer

    keith reimer

    I was referred to this product many years ago while I resided in California. Since using this Diesel extreme my truck has better mileage, better power and has contributed to the life and longevity on my F-250 6.0 motor. Love this stuff.

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  45. keith reimer

    352,000 miles and still running strong

    keith reimer (verified owner)

    I was referred to this product many years ago while I resided in California. Since using this Diesel extreme my truck has better mileage, better power and has contributed to the life and longevity on my F-250 6.0 motor. Love this stuff.

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  46. Daniel Wold

    Daniel Wold

    prior to using this product, my 2004 6.0L would sound like a 7.3 L on the cold days. now i run it one oil change a year, the cold months.

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  47. Daniel Wold

    5 out of 5

    Daniel Wold

    prior to using this product, my 2004 6.0L would sound like a 7.3 L on the cold days. now i run it one oil change a year, the cold months.

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  48. Jerry

    Jerry

    All in one injectior cleaner ,fuel system cleaner.. you will see a different in response and mileage after use .has a moisture dispersant to get the water out of the tank .Does what it’s supposed to

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  49. Jerry

    5 out of 5 Reduced black smoke

    Jerry (verified owner)

    All in one injectior cleaner ,fuel system cleaner.. you will see a different in response and mileage after use .has a moisture dispersant to get the water out of the tank .Does what it’s supposed to

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  50. James

    James

    Hi I have a 2000 f250 with the 7.3l and it has just almost hit 300,000 miles on it and is very sluggish and low power. I had an oil leak and changed the egr valve and no more leak.. so I got the oil treatment and the fuel additive and the fr3 I think.. but I know the fuel is for every 6k miles but how much and how often do I use the other fuel treatment.. fr3 I think.. I have a 34gal tank

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  51. James

    Question

    James

    Hi I have a 2000 f250 with the 7.3l and it has just almost hit 300,000 miles on it and is very sluggish and low power. I had an oil leak and changed the egr valve and no more leak.. so I got the oil treatment and the fuel additive and the fr3 I think.. but I know the fuel is for every 6k miles but how much and how often do I use the other fuel treatment.. fr3 I think.. I have a 34gal tank

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    • Levi

      Levi (verified owner)

      Hi James, the other fuel additive I think you’re referring to is EDT Everyday Diesel Treatment. It is to be used every fill-up, thanks!

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  52. Trenton Russey

    Trenton Russey

    I️ was wondering how much I could use in one use. With diesel Kleen I️ could use the whole bottle is that the same with your diesel extreme?

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  53. Trenton Russey

    How much is safe in one use

    Trenton Russey

    I️ was wondering how much I could use in one use. With diesel Kleen I️ could use the whole bottle is that the same with your diesel extreme?

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    • Levi

      Levi (verified owner)

      Hi Trenton, it really depends on the size bottle and fuel tank. For example a 16 ounce bottle treats 40 gallons but is safe to treat 30-40 gallons roughly. The best results are not over-dosing, but back-to-back treatments when necessary. Hope that helps!

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  54. wayland

    wayland

    used on Kubota tractor. no more black smoke. more power.

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  55. wayland

    5 out of 5 wayland

    wayland (verified owner)

    used on Kubota tractor. no more black smoke. more power.

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  56. John Clark

    John Clark

    Have 2002 F350 7.3 diesel with 115,000 miles. Towed 4 horse goose neck trailer with 2 horses from CA to NM and back. After using this product for the first time mileage improved from around 13mpg to over 15mpg while towing.

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  57. John Clark

    5 out of 5 Improved Mileage

    John Clark (verified owner)

    Have 2002 F350 7.3 diesel with 115,000 miles. Towed 4 horse goose neck trailer with 2 horses from CA to NM and back. After using this product for the first time mileage improved from around 13mpg to over 15mpg while towing.

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  58. Chris

    Chris

    Does this work well when temps are below freezing?

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  59. Chris

    Question

    Chris

    Does this work well when temps are below freezing?

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    • Levi

      Levi (verified owner)

      Yes, in addition to the Diesel Winter Anti-Gel (it will help with other adverse affects such as asphaltines and Internal Diesel Injector Deposits (IDIDs).

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  60. 86chevy

    86chevy

    I own a 86 Chevy cucv with a 6.2 diesel I keep getting told to put additives in the fuel for lubricants , and add cetain and surfer boost as that’s when the motor was built to run on what products should I run I’m putting 911 in the tank every so often but I’m not completely sure what is the best thing for it , it is also a NA naturally aspirated diesel non turbo if that helps

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  61. 86chevy

    Question

    86chevy

    I own a 86 Chevy cucv with a 6.2 diesel I keep getting told to put additives in the fuel for lubricants , and add cetain and surfer boost as that’s when the motor was built to run on what products should I run I’m putting 911 in the tank every so often but I’m not completely sure what is the best thing for it , it is also a NA naturally aspirated diesel non turbo if that helps

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    • Levi

      Levi (verified owner)

      Hello! You are definitely on the right track with using the Diesel Extreme first, followed by our EDT fuel additive every tank to help with lubricity and cetane boost! Also, with that age of engine, it is worth using the Stiction Eliminator to clean out everything in the entire oil system…thanks!

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  62. Grant Hickman

    Grant Hickman

    I have a 2016 Ram 6.7l with 27,500 miles. I have used Royal Purple from the first oil change. I wanted to start the preventative measures now. I have started with the Diesel Extreme, EDT and now with my oil change the Stiction Eliminater. Will I be able to see or tell much affects from these products?

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  63. Grant Hickman

    Question

    Grant Hickman

    I have a 2016 Ram 6.7l with 27,500 miles. I have used Royal Purple from the first oil change. I wanted to start the preventative measures now. I have started with the Diesel Extreme, EDT and now with my oil change the Stiction Eliminater. Will I be able to see or tell much affects from these products?

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    • Levi

      Levi (verified owner)

      Hi Grant, with that few miles you are on the right track with preventative maintenance, and should see a difference with Diesel Extreme and reduced regen. cycles. Also, most likely the EDT depending on the quality of fuel in your area.

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  64. Scott

    Scott

    06 f350 with delayed Turbo spool up…..what might help??

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  65. Scott

    Question

    Scott

    06 f350 with delayed Turbo spool up…..what might help??

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    • Levi

      Levi (verified owner)

      Hi Scott, the Stiction Eliminator is the product to directly help restore any turbo issues, thanks!

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  66. Bobby

    Bobby

    This product is fabulous, started using last year in VW and Ford Diesels, A1 product , no start issues or fuel issues what so ever

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  67. Bobby

    5 out of 5 Diesel Extreme

    Bobby (verified owner)

    This product is fabulous, started using last year in VW and Ford Diesels, A1 product , no start issues or fuel issues what so ever

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  68. Jake

    Jake

    Added as an additive for maintenance will see how it treats me. Also got some anti-gel as it’s starting to get cold in Wisconsin! Thanks fellas!

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  69. Jake

    First use

    Jake (verified owner)

    Added as an additive for maintenance will see how it treats me. Also got some anti-gel as it’s starting to get cold in Wisconsin! Thanks fellas!

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  70. Todd E

    Todd E

    I have a 2003 f250 with a 7.3 power stroke has 268k miles it began to idle a little rough so I added the extreme diesel to fuel 10 oz to 25 gal at around 300 miles I noticed it had smoothed out ! No more rough idiling !! Very happy with your product

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  71. Todd E

    5 out of 5 Diesel extreme

    Todd E (verified owner)

    I have a 2003 f250 with a 7.3 power stroke has 268k miles it began to idle a little rough so I added the extreme diesel to fuel 10 oz to 25 gal at around 300 miles I noticed it had smoothed out ! No more rough idiling !! Very happy with your product

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  72. Dick E

    Dick E

    Engine was missing and slapping with White smoke just started out of the blue a few weeks ago. I ordered the diesel extreme, I added to fuel per instructions, ran it for 10 minutes at idle and shut it off. 2 days later I figured I would troubleshoot one last time before disassembling and was happy to say the problem was gone when I fired her up. Still running great

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  73. Dick E

    5 out of 5 HUMVEE 1986 6.5l

    Dick E

    Engine was missing and slapping with White smoke just started out of the blue a few weeks ago. I ordered the diesel extreme, I added to fuel per instructions, ran it for 10 minutes at idle and shut it off. 2 days later I figured I would troubleshoot one last time before disassembling and was happy to say the problem was gone when I fired her up. Still running great

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  74. Cliff G.

    Cliff G.

    I had a starting problem with the fuel system, low pressure, low idle, and low boost on my 2004 f250 6.0, friends told me about this stuff and for two years I had not bought it. Today I did and I drove it for about an hour after adding 32 ounces to the oil and 12 ounces to the fuel, had about 15 gal in the tank. When I started it I had the same problem with starting and low Idle, took it for another ride and holy toledo I had increased boost and acceleration. When I got back the starting problems went away idles great. You saved me from being raped by a dealership…..Thanks

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  75. Cliff G.

    Holy toledo

    Cliff G.

    I had a starting problem with the fuel system, low pressure, low idle, and low boost on my 2004 f250 6.0, friends told me about this stuff and for two years I had not bought it. Today I did and I drove it for about an hour after adding 32 ounces to the oil and 12 ounces to the fuel, had about 15 gal in the tank. When I started it I had the same problem with starting and low Idle, took it for another ride and holy toledo I had increased boost and acceleration. When I got back the starting problems went away idles great. You saved me from being raped by a dealership…..Thanks

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  76. Brian

    Brian

    I just put in my first dose of Diesel Extreme in my ’05 F250 6.0 and went a little heavy by mistake (probably .8qt instead of .5qt), will this hurt anything?

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  77. Brian

    First use of Diesel Extreme

    Brian

    I just put in my first dose of Diesel Extreme in my ’05 F250 6.0 and went a little heavy by mistake (probably .8qt instead of .5qt), will this hurt anything?

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    • Levi

      Levi (verified owner)

      Nope you are still on the safe-side with the dosage you listed; thanks and keep us posted!

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  78. Jack

    Jack (verified owner)

    Diesel Extreme

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  79. Jack

    12K Miles per month @ 8.5 MPG

    Jack (verified owner)

    Diesel Extreme

    Photo has been removed

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  80. George Cura

    George Cura

    I was impressed the Oil Stiction Eliminator that I had to try the Diesel Extreme. The performance is back. Light throttle on maintaining speeds and very little black smoke on acceleration. Great products, you won’t be disappointed.

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  81. George Cura

    5 out of 5 Injector Care

    George Cura (verified owner)

    I was impressed the Oil Stiction Eliminator that I had to try the Diesel Extreme. The performance is back. Light throttle on maintaining speeds and very little black smoke on acceleration. Great products, you won’t be disappointed.

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  82. john

    john

    I have a 2002 F350 Super Duty with the 7.3 engine and 115K miles. Just purchased you diesel extreme fuel treatment product. Assume I should put this additive in before filling the tank so it can mix? How often should I use this product? I also read a review that someones fuel filter was black after using your product. I just changed my fuel filter do I need to change more frequently?

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  83. john

    How to use this product..

    john (verified owner)

    I have a 2002 F350 Super Duty with the 7.3 engine and 115K miles. Just purchased you diesel extreme fuel treatment product. Assume I should put this additive in before filling the tank so it can mix? How often should I use this product? I also read a review that someones fuel filter was black after using your product. I just changed my fuel filter do I need to change more frequently?

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    • Levi

      Levi (verified owner)

      Yes, please add right before filling (ideally near-empty tank). It is recommended every 6 months/6,000 miles; and it is possible you would need to at least check the fuel filter only after the initial treatment…thanks!

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  84. MIKE JOHNSON

    MIKE JOHNSON

    I have a 34gal tank on my one ton will 16oz be to much first time using do I do the 2to 3 back to back is it one time deal and use 16oz every 6months I am going to get the oil treatment and the EDT ps. 07duramax3500 131000 miles black smoke on ile and taking off hard

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  85. MIKE JOHNSON

    Question

    MIKE JOHNSON

    I have a 34gal tank on my one ton will 16oz be to much first time using do I do the 2to 3 back to back is it one time deal and use 16oz every 6months I am going to get the oil treatment and the EDT ps. 07duramax3500 131000 miles black smoke on ile and taking off hard

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    • Levi

      Levi (verified owner)

      16 oz is fine, also 2-3 back to back, followed by 16 oz every 6 months. Both oil and fuel additives will help the symptoms you mentioned, or your money-back!

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  86. Doug Dikun

    Doug Dikun

    If starting with a clean system, or coming off a diesel extreme treatment. And then a steady diet of EDT, why the need to retreat with diesel extreme? Thanks ,doug

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  87. Doug Dikun

    Question

    Doug Dikun

    If starting with a clean system, or coming off a diesel extreme treatment. And then a steady diet of EDT, why the need to retreat with diesel extreme? Thanks ,doug

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    • Levi

      Levi (verified owner)

      Hi Doug, it is a similar analogy to brushing your teeth daily (EDT), but still going to the dentist every 6 months (Diesel Extreme) for a deep clean…hope that makes sense!

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  88. John T.

    John T.

    Will your diesel fuel additive react with any other products from other brands such as Lucas or Cerma?

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  89. John T.

    Question

    John T.

    Will your diesel fuel additive react with any other products from other brands such as Lucas or Cerma?

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    • Levi

      Levi (verified owner)

      It is unlikely that it will react negatively, HOWEVER, we do not recommend mixing fuel additives (including our own), thanks!

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  90. Todd

    Todd

    Ran the diesel extreme through my truck and changed the fuel filters at same time WOW. Did it clean out my fuel system. Less than 1000 miles I ran out the last of diesel extreme and pulled my fuel filters they were coal black. I have 305,000 miles on my truck and have never seen my filters that dirty and they are usually only changed every 10,000 miles. So I know that it really cleaned my entire fuel system will definitely be using Diesel Extreme again.

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  91. Todd

    5 out of 5 Diesel Extreme

    Todd (verified owner)

    Ran the diesel extreme through my truck and changed the fuel filters at same time WOW. Did it clean out my fuel system. Less than 1000 miles I ran out the last of diesel extreme and pulled my fuel filters they were coal black. I have 305,000 miles on my truck and have never seen my filters that dirty and they are usually only changed every 10,000 miles. So I know that it really cleaned my entire fuel system will definitely be using Diesel Extreme again.

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  92. kenna

    kenna

    Emissions definitely reduced. Diesel consumption unchanged in some applications. Would recommend.

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  93. kenna

    Noticeable Difference

    kenna (verified owner)

    Emissions definitely reduced. Diesel consumption unchanged in some applications. Would recommend.

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  94. Randy Rink

    Randy Rink

    I used Diesel Extreme in the fuel and Stiction eliminator in the synthetic oil and it solved the stumbling at startup at the very first turn of the key. I am no longer worried about winter start-up, Thanks

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  95. Randy Rink

    5 out of 5 Your products worked nicely on my New Holland turbo skid steer loader.

    Randy Rink (verified owner)

    I used Diesel Extreme in the fuel and Stiction eliminator in the synthetic oil and it solved the stumbling at startup at the very first turn of the key. I am no longer worried about winter start-up, Thanks

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  96. Lyle

    Lyle

    I have an 02 lb7 duramax with the amazing injector problem. Just bought the diesel extreme. Will this help eliminate my white smoke issue. Smokes during idle. Smokes while in drive and smokes on take off. Some days smoke more than others. Will this help and how many treatments will I need to do before I get these notorious lb7 injectors restored?

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  97. Lyle

    Question

    Lyle (verified owner)

    I have an 02 lb7 duramax with the amazing injector problem. Just bought the diesel extreme. Will this help eliminate my white smoke issue. Smokes during idle. Smokes while in drive and smokes on take off. Some days smoke more than others. Will this help and how many treatments will I need to do before I get these notorious lb7 injectors restored?

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    • Lyle

      Lyle (verified owner)

      Ok thank you Levi I will give it a try and see how she runs the next few weeks thank you.

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    • Levi

      Levi (verified owner)

      Hi Lyle, yes the Diesel Extreme is the product to use! Simply use the recommended treatment in 2 or 3 back-to-back fill-ups and it will restore the injectors (or your money-back!)

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  98. Joe Sylvester

    Joe Sylvester

    I have a semiclogged diesel injector, can I add extra to the first 12ounces Im putting into the full tank to make it work faster or will that hurt something??I changed the EGR valve as it did have alot of carbon on it.

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  99. Joe Sylvester

    Question

    Joe Sylvester (verified owner)

    I have a semiclogged diesel injector, can I add extra to the first 12ounces Im putting into the full tank to make it work faster or will that hurt something??I changed the EGR valve as it did have alot of carbon on it.

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    • Levi

      Levi (verified owner)

      Hi Joe, it won’t hurt but it will be more beneficial to use the recommended treatment in 2 or 3 back-to-back fill-ups vs. a higher concentration per tank. Keep us posted!

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  100. Pat M

    Pat M

    Have a large class 8 heavy duty fleet, mostly Mack engines, with some Cummins new and old. Are there any issues of voiding manufacturer warranties.

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  101. Pat M

    Question

    Pat M

    Have a large class 8 heavy duty fleet, mostly Mack engines, with some Cummins new and old. Are there any issues of voiding manufacturer warranties.

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    • Levi

      Levi (verified owner)

      Hi Pat, no there are no chances of voiding warranties. In fact, a major engine manufacturer has essentially admitted the necessity of fuel additives recently. Please see “Magnuson–Moss Warranty Act” for more information, thanks!

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  102. Chris Grabow

    Chris Grabow

    Used your extreme additive and injector cleaner and let me says with in 1 and 1/2 hours I’ve noticed cleaner idle and a definite power increase everyone has told me to start in second first gear was so dogish second wasn’t much better I bought a used 6.0 with a 6speed I can tell a difference thank you! Any other recommendations?

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  103. Chris Grabow

    5 out of 5 This Product ROCKS

    Chris Grabow

    Used your extreme additive and injector cleaner and let me says with in 1 and 1/2 hours I’ve noticed cleaner idle and a definite power increase everyone has told me to start in second first gear was so dogish second wasn’t much better I bought a used 6.0 with a 6speed I can tell a difference thank you! Any other recommendations?

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  104. Tom M

    Tom M

    I like this product. I was have a fuel problem every time I pulled a trailer. The warning light would come on and reduce power on my 2008 Chevy dully. I have a Duromac diesel and I continued to fight the problem of changing the fuel filter. The last time it happened I had about 200 miles on a new filter. After checking with a Diesel mechanic he said I would need new injectors at a price of about $7,000. Then I went on line to see what the injectors would cost and do the job myself, that when I saw your ad for diesel extreme and thought I would try your product prior to changing injectors. I’m seeing a major change in the performance of my truck not to mention an increase in mpg. Your price is a lot cheaper than changing injectors. I mentioned your product to a friend and he stated he has already been using this product and doesn’t have any problems with fuel filters and doesn’t pull any maintenance until after 3000 miles and he also pulls trailers. I just purchased your EDT to add in my fuel.

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  105. Tom M

    5 out of 5 Diesel extreme

    Tom M (verified owner)

    I like this product. I was have a fuel problem every time I pulled a trailer. The warning light would come on and reduce power on my 2008 Chevy dully. I have a Duromac diesel and I continued to fight the problem of changing the fuel filter. The last time it happened I had about 200 miles on a new filter. After checking with a Diesel mechanic he said I would need new injectors at a price of about $7,000. Then I went on line to see what the injectors would cost and do the job myself, that when I saw your ad for diesel extreme and thought I would try your product prior to changing injectors. I’m seeing a major change in the performance of my truck not to mention an increase in mpg. Your price is a lot cheaper than changing injectors. I mentioned your product to a friend and he stated he has already been using this product and doesn’t have any problems with fuel filters and doesn’t pull any maintenance until after 3000 miles and he also pulls trailers. I just purchased your EDT to add in my fuel.

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  106. Octavio

    Octavio

    I have a 1996 n-14 celect plus cummins, it gets the shivers at idle and seems to have an injector getting stuck and a little bit of white smoke at idle. Could the diesel extreme possibly fix a sticking injector??

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  107. Octavio

    Question

    Octavio

    I have a 1996 n-14 celect plus cummins, it gets the shivers at idle and seems to have an injector getting stuck and a little bit of white smoke at idle. Could the diesel extreme possibly fix a sticking injector??

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    • Levi

      Levi (verified owner)

      Yes absolutely, if it doesn’t we’ll give you your money back!

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  108. Sean Jeffries

    Sean Jeffries

    This made my engine run smoother and better. Will recommend to anyone.

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  109. Sean Jeffries

    Exellent Product!

    Sean Jeffries (verified owner)

    This made my engine run smoother and better. Will recommend to anyone.

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  110. Kurt

    Kurt

    Will this harm an Airbog lift pump?

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  111. Kurt

    Question

    Kurt

    Will this harm an Airbog lift pump?

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    • Levi

      Levi (verified owner)

      If you are referring to an *Airdog pump, no, it will not have any harmful effects, Kurt!

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  112. Jimi w

    Jimi w

    I have a 2016 ram 1500 ecodiesel with 9456 miles. I just want to keep it clean and running good. Will this help with that. I’m a big fan of Lucas brand. I use the Lucas injector cleaner and upper cylinder lubrication .can I use this about 4 times a year with Lucas to help keep it running good and clean. With no problems with the particular filters . Thank you, jim

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  113. Jimi w

    Question

    Jimi w

    I have a 2016 ram 1500 ecodiesel with 9456 miles. I just want to keep it clean and running good. Will this help with that. I’m a big fan of Lucas brand. I use the Lucas injector cleaner and upper cylinder lubrication .can I use this about 4 times a year with Lucas to help keep it running good and clean. With no problems with the particular filters . Thank you, jim

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    • Brandon

      Brandon

      one more question. When using the stiction eliminator in a 94 7.3 do I leave some of the oil out to counter the 64oz of eliminator? Thanks

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    • Levi

      Levi (verified owner)

      Yes, please replace 64 oz/ 2 quarts of oil when using Stiction Eliminator…thanks!

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    • Brandon

      Brandon

      So I can use this stuff on my 1994 7.3 idi? All of the products

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    • Levi

      Levi (verified owner)

      Yes absolutely, Brandon! All products…

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    • Levi

      Levi (verified owner)

      Hi Jim, yes the Diesel Extreme 4 times a year will be a great regimen for the EcoDiesel. Just don’t use in the same tank as Lucas, or mix additives in general.

      Also, we think you’ll love our EDT (Everyday Diesel Treatment) fuel additive in between treatments of Diesel Extreme!

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  114. Jason

    Jason

    Seemes to improve throttle response

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  115. Jason

    4 out of 5 Works great

    Jason (verified owner)

    Seemes to improve throttle response

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  116. Mike

    Mike

    Hvea mis at1500 rpm then goes way all read did the oir deffant different now i want to ad the fuel extreme will it help i would like to put it in the filter then the tank

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  117. Mike

    Question

    Mike

    Hvea mis at1500 rpm then goes way all read did the oir deffant different now i want to ad the fuel extreme will it help i would like to put it in the filter then the tank

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    • Levi

      Levi (verified owner)

      Yes it will definitely help if it’s an intermittent miss! What type of vehicle/engine?

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  118. Steve

    Steve

    Cost aside, any harm in running your Diesel Extreme 16oz per every 30-35 gallon tankful , instead of using your EDT? The reason is I’ve got a new- used 2006 Cummins that has had its injectors and fuel neglected, and I want to drop the proverbial hammer on potential injector problems and eliminate excessive small amounts black smoke coming out of pipe upon acceleration.

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  119. Steve

    Question

    Steve

    Cost aside, any harm in running your Diesel Extreme 16oz per every 30-35 gallon tankful , instead of using your EDT? The reason is I’ve got a new- used 2006 Cummins that has had its injectors and fuel neglected, and I want to drop the proverbial hammer on potential injector problems and eliminate excessive small amounts black smoke coming out of pipe upon acceleration.

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    • Levi

      Levi (verified owner)

      Hi Steve, we don’t recommend using the full dose for more than 2-3 tankfuls every 6 months/6,000 miles. If you do want to use Diesel Extreme every tank, only 1-2 ounces is necessary, thanks!

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  120. Jeffrey

    Jeffrey

    95000 miles on my Cat 3126B when I bought it and the previous owner never added anything, it had been sitting for almost a year when I bought it, it was starting hard, idle RPM was surging from 720 to 770, someone told me to try Diesel Extreme so I did, within a couple hundred miles it was getting better, after 2 tankfuls about 1200 miles it now starts good, runs smooth and idles at 750 plus or minus 5 rpm. I am now about 2000 miles into the Stiction Eliminator and it sounds smother, no smoke. I am very happy with both of these products.

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  121. Jeffrey

    5 out of 5 Quick start and smooth, I am sold on Diesel Extreme

    Jeffrey (verified owner)

    95000 miles on my Cat 3126B when I bought it and the previous owner never added anything, it had been sitting for almost a year when I bought it, it was starting hard, idle RPM was surging from 720 to 770, someone told me to try Diesel Extreme so I did, within a couple hundred miles it was getting better, after 2 tankfuls about 1200 miles it now starts good, runs smooth and idles at 750 plus or minus 5 rpm. I am now about 2000 miles into the Stiction Eliminator and it sounds smother, no smoke. I am very happy with both of these products.

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  122. Marschal

    Marschal

    It really works

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  123. Marschal

    5 out of 5 Love this product

    Marschal

    It really works

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  124. Seth

    Seth

    This is a great product what ever you guys are doing is like magic in a bottle fuel mileage dramatically increased and my egts are staying quite low are using this product! Great great product

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  125. Seth

    5 out of 5 Helped rough idle and fuel mileage a lot!

    Seth (verified owner)

    This is a great product what ever you guys are doing is like magic in a bottle fuel mileage dramatically increased and my egts are staying quite low are using this product! Great great product

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  126. Jose feliciano

    Jose feliciano

    I have a 03 f250 with a 6.0 and I added your fuel cleaner and after only 40 miles of driving the started smoking and just shut down. Truck ran good just added for maintenance to keep it that way. Any suggestions.

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  127. Jose feliciano

    Question

    Jose feliciano

    I have a 03 f250 with a 6.0 and I added your fuel cleaner and after only 40 miles of driving the started smoking and just shut down. Truck ran good just added for maintenance to keep it that way. Any suggestions.

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    • Levi

      Levi (verified owner)

      Hi Jose, please give us a call to speak with one of our diesel technicians: 1-800-341-6516

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  128. Steven Barousse

    Steven Barousse

    Will this remove fungus algea and stuff in full storage tanks?

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  129. Steven Barousse

    Question

    Steven Barousse

    Will this remove fungus algea and stuff in full storage tanks?

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    • Levi

      Levi (verified owner)

      Hi Steven, no it does not. It does prevent fungus and algae via the moisture dispersant. Please give us a call at 800-341-6516 to buy a product called MP8 Microbicide, thanks!

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  130. david

    david

    will diesel extreme help clean 6.4 fuel system

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  131. david

    Question

    david

    will diesel extreme help clean 6.4 fuel system

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    • Levi

      Levi (verified owner)

      Yes absolutely, or your money-back!

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  132. Gabe Adair

    Gabe Adair

    Can you “over use” diesel extreme?

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  133. Gabe Adair

    Question

    Gabe Adair

    Can you “over use” diesel extreme?

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    • Levi

      Levi (verified owner)

      Hello Gabe, while we have heard a handful of extreme cases of too much per tank, we recommend sticking with the dosage rate per gallon, and 2 tank-fulls max every 6 months/6,000 miles. Do you have a concern in particular?

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  134. Cody

    Cody

    Update: I was contacted today regarding the leaking bottles. I was assured that there was an issue with the bottle seals from the manufacturer, I was assured the problem will no longer be an issue. The customer service is pretty good and quickly reached out to resolve the issue.

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  135. Cody

    Cody (verified owner)

    Update: I was contacted today regarding the leaking bottles. I was assured that there was an issue with the bottle seals from the manufacturer, I was assured the problem will no longer be an issue. The customer service is pretty good and quickly reached out to resolve the issue.

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  136. Seth

    Seth

    My fuel mileage dropped severely in my 7.3 indirect injection from 17 to 10 mpg will this help?

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  137. Seth

    Question

    Seth

    My fuel mileage dropped severely in my 7.3 indirect injection from 17 to 10 mpg will this help?

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    • Levi

      Levi (verified owner)

      Hi Seth, while we hesitate to guarantee any specific MPG restoration, it is highly likely that the Diesel Extreme, followed by the EDT fuel additive will help! We do honor our money-back satisfaction-guarantee if you are not impressed; just be sure keep the receipt!

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  138. Debra m.

    Debra m.

    hey, i have a 1997 ford F350 diesel truck and was wondering is the diesel extreme will mess my truck up in any way or if there will be and cons while adding the diesel extreme?

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  139. Debra m.

    Question

    Debra m.

    hey, i have a 1997 ford F350 diesel truck and was wondering is the diesel extreme will mess my truck up in any way or if there will be and cons while adding the diesel extreme?

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    • Levi

      Levi (verified owner)

      Hello Debra, there is no chance of the Diesel Extreme messing up the truck by itself. Please follow the recommended dosage and treatment intervals, and let us know if you have any other questions or concerns!

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  140. Jay A.

    Jay A.

    This stuff blows away all other diesel additives!

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  141. Jay A.

    5 out of 5 Best diesel additive I've used

    Jay A. (verified owner)

    This stuff blows away all other diesel additives!

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  142. John

    John

    If I but Diesel Extreme in this fill up when would I add EDT. Thank you

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  143. John

    Question

    John

    If I but Diesel Extreme in this fill up when would I add EDT. Thank you

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    • Levi

      Levi (verified owner)

      Hi John, on the next fill-up, and ideally every fill-up after until you are ready to use Diesel Extreme again for maintenance. Thanks!

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  144. John Ward

    John Ward

    I have a 2005 Dodge 2500 with a Cummins 5.9 engine. I have been using Moreys Diesel Quench for years with good results. It appears that it is no longer available in the USA. Do you have a comparable product that you can recommend?

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  145. John Ward

    Question

    John Ward

    I have a 2005 Dodge 2500 with a Cummins 5.9 engine. I have been using Moreys Diesel Quench for years with good results. It appears that it is no longer available in the USA. Do you have a comparable product that you can recommend?

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    • Levi

      Levi (verified owner)

      Hello and yes, John! I did some research, and first of all I see it is from the other Lubrication Specialties in California (no connection whatsoever). You should see better-than-comparable results as shown below!

      The first/main differentiator in Diesel Extreme to look for on an SDS sheet is 2-Ethylhexyl:
      Morey’s Diesel Quench: <10%
      - Hot Shot's Secret Diesel Extreme: 49%

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  146. Brendon

    Brendon

    Will this help level out my injector balance rates on my LLY Duramax? I also occasionally have a small puff of white smoke on cold start up, none while idling or driving though. Thanks in advance

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  147. Brendon

    Brendon

    Will this help level out my injector balance rates on my LLY Duramax? I also occasionally have a small puff of white smoke on cold start up, none while idling or driving though. Thanks in advance

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    • Jim

      Jim

      As a user of Diesel Extreme and Stiction Remover…. I have Two questions for you, 1) In regards to your reply above to “Brendon” and his LLY Duramax… you made the ending comment…” not the notorious LB7″…. what is the reasoning behind the comment, out of curiosity…. and 2) What is the safe (re: still useful) storage “Shelf Life” of Diesel Extreme & the Stiction Remover…. in a cool (but NOT Damp) semi-dark enviroment (re: basement with wood & steel framed storage racks)… with year round basement temps between 60 and 72 degrees?

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    • Levi

      Levi (verified owner)

      Hi Jim, that was referring to especially early model LB7s which are known for high injector failures and high replacement expense (relative to other non-HEUI injectors). Also, the shelf life is a few years, but please shake vigorously if using after months of storage, thanks!

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    • Levi

      Levi (verified owner)

      Hi Brendon, there is a great chance this will restore injector balance rates and eliminate the smoke! We guarantee it or your money back (especially since you specified LLY not the notorious LB7 😉

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  148. Robert Reilly

    Robert Reilly

    I didn’t think my injectors were dirty but i ran the diesel extreme anyway and i was shocked by the change it made, my engine started to run smoother and i had to change injection timing due to the fact i was getting more fuel injected than before! I highly recommend diesel extreme!

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  149. Robert Reilly

    Shocked at what happened

    Robert Reilly (verified owner)

    I didn’t think my injectors were dirty but i ran the diesel extreme anyway and i was shocked by the change it made, my engine started to run smoother and i had to change injection timing due to the fact i was getting more fuel injected than before! I highly recommend diesel extreme!

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    • Robert Reilly

      Robert Reilly (verified owner)

      5 stars

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  150. Thomas

    Thomas

    Is this safe to use in emissions controlled fords? Is your oil aditiive also safe?