15W-40 Engine Oil

Top-Performing 15W-40 Engine Oil

Hot Shot’s Secret advanced formulations featuring FR3 Nano Technology^® set a new standard. This innovative technology reduces wear, extending engine life while boosting efficiency and performance. Explore our high-performance 15W-40 oils to find the perfect fit for your engine.

What Is 15W-40 Engine Oil?

15W-40 is a versatile multi-grade diesel engine oil. Here’s what the numbers mean:

– 15W: This indicates the oil’s viscosity, or thickness, at low temperatures. The “W” stands for winter, and a lower number means a thinner viscosity. Thinner oil flows faster in cold weather to protect your engine.
– 40: This number represents the oil’s viscosity at high operating temperatures. Like with the first number, a higher value is thicker. A thick oil layer protects engine parts when they get hot.

Discover Hot Shot’s Secret 15W-40 Oil Lineup

All Hot Shot’s Secret engine oils feature our proprietary FR3 Nano Technology^®. Our FR3 Friction Reducer^® boosts lubrication and decreases wear by up to 43%. Let’s meet our range of high-performance 15W-40 products:

Green Diamond Fleet Oil 15W-40

We designed our Green Diamond Fleet Oil to meet high-demand operating conditions of most vehicles and equipment. This product is ideal for stop-and-go fleets and heavy-haul vehicles. Green Diamond Fleet Oil suits most diesel engines, offering excellent thermal stability and oxidation to keep your oil cleaner for longer.

This oil performs well in extreme temperatures. Experience better cold-weather starting. Like our other 15W-40 products, it also boosts power, fuel economy and oil consumption.

Choose between semi-synthetic or full synthetic oil. Green Diamond Fleet semi-synthetic oil blends Group II and Group III base oils, while the 100% full synthetic uses only Group III oils. Both variations have similar benefits, but full synthetics provide better lubrication and longevity.

Blue Diamond PAO Oil 15W-40

Our Blue Diamond PAO 15W-40 Oil is a 100% full polyalphaolefin (PAO) synthetic. This allows for long drain intervals without compromising protection.

PAO oils need fewer viscosity enhancers to meet weight requirements, leaving more room for other additives. It uses Group IV and Group V base oils for superior oxidation stability.

Here’s a breakdown of Blue Diamond PAO oil’s top benefits:

– Enhanced performance: Performance additives give you more horsepower and mileage. Experience better power and higher RPM turbo quality.
– Improved efficiency: Using this product reduces oil consumption. It can increase fuel economy by up to 3%.
– Cleaner engine: Compared to CJ-4 oils, Blue Diamond PAO boasts 46% better soot handling.
– Less wear: This oil protects your engine’s components, reducing wear by 71% more than CJ-4. The result? Less friction and a longer engine life.
– Extended oil intervals: With regular monitoring, you can run clean oil for 50,000 to 100,000 miles.
– Meets specifications: The PAO oil meets CK-4 and Ford WSS-M2C171-F1 specifications. It also features backwards compatibility with CJ-4 and C14 Plus.

Black Diamond Outlaw Oil 15W-40

Hot Shot’s Secret Black Diamond Outlaw 15W-40 is a powerhouse diesel oil. This 100% PAO synthetic bursts with additives for unparalleled performance and protection. Its high-viscosity Group IV base oil makes this product even tougher. For deleted or non-DPF engines due to the high TBN and zinc levels.

Check out these benefits of Black Diamond Outlaw Oil:

– Higher TBN: The Total Base Number (TBN) measures the oil’s active detergents and dispersants. A higher TBN number means a cleaner, more protected engine. Black Diamond Outlaw Oil has a TBN of 14.
– Power and efficiency gains: This heavy-duty oil boosts horsepower and fuel economy up to 3%.
– Added zinc: Metal-to-metal contact in your engine leads to friction and wear. Zinc creates a protective barrier on metal surfaces. Our Black Diamond Outlaw Oil has almost three times the zinc of CK-4 oil.
– Increased antimony: Black Diamond Outlaw Oil boasts antimony levels over 400 ppm. Antimony is an extreme-pressure, anti-wear additive that inhibits oxidation, rust and corrosion.
– Superior protection: The additives in this oil translate into outstanding protection. Reduced shearing, deposit formation and wear result in exceptional performance. Increased film strength further protects against wear.

Black Diamond Outlaw Oil may not suit all diesel engines. Avoid it if your vehicle has diesel particulate filters (DPF), EGR, catalytic converters or emission equipment.

Choosing the Best 15W-40 Diesel Oil

All our high-performance 15W-40 oils offer enhanced power, longevity and protection. They also suit the same applications. These oils are ideal for:

– Heavy-duty trucks
– Agriculture
– Stationary engines
– Construction
– Industrial equipment
– Drilling rigs
– Turbo or racing engines

Best for Most Diesel Engines: Blue Diamond PAO Oil 15W-40

Blue Diamond PAO Oil is a multipurpose diesel workhorse. It works just as well in passenger vehicles as it does in commercial trucks. This product is safe to use with DPF, catalytic converters or other emission systems. Choose this option for optimal diesel engine performance.

Best for Most Users: Green Diamond Fleet Oil 15W-40

If your fleet hauls heavy loads or sits in stop-and-start traffic, Green Diamond Fleet is the oil for you. It performs well in many diesel engines. Extended oil change intervals, reduced wear and longer component lifespan reduce maintenance costs.

Best for Off-Road Use: Black Diamond Outlaw Oil 15W-40

When you want ultimate protection and a high TBN, pick Black Diamond Outlaw Oil. The secret to its unmatched performance is the extras. A combination of extreme-pressure additives, CK-4 and FR3 Nano Technology, provides ultimate protection. If you run your diesel hard, this product is ideal.

Remember, Black Diamond Outlaw Oil is not intended for equipment with emission systems.

Shop Our Performance-Boosting Engine Oils

Upgrade to our 15W-40 oil for extraordinary performance, longevity and fuel efficiency. Discover the difference our science-powered oils can make to your engine!

Shop Hot Shot’s Secret engine oils or browse our advanced additives.

15W-40 Oil FAQs

These answers to common questions can help you decide if 15W-40 oil is right for your engine:

What’s the Difference Between 15W-40 and 10W-30?

The difference lies in the viscosity — 15W-40 is thicker, while 10W-30 is thinner. 15W-40 performs better in higher temperatures and has greater film strength. 10W-30 oil’s thinner consistency flows faster in cold temperatures. It offers improved cold-start performance.

Browse our range of 10W-30 oils:

Why Choose Synthetic Engine Oil?

Conventional oil has a refined crude oil base. Its thick consistency makes it run slower through the engine, impacting performance. Synthetic oils consist of artificial substances. They have a lower viscosity and an impurity-free, uniform molecular structure.

15W-40 full synthetic oil consists of 100% purified, chemically engineered oil. Full synthetic oils offer the greatest performance and longevity.

Can I Switch From Conventional to 15W-40 Oil?

While you can switch, check your owner’s manual for the recommended viscosity grade. This grade indicates the oil’s operating temperature. It can affect how your engine performs at higher or lower temperatures. 15W-40 oil’s viscosity grade is 15 at 0 degrees Fahrenheit and 40 at its operating temperature of 212 degrees Fahrenheit.