Ultra Premium DEF Fluid™

Get the Most Out of Your Diesel Engine

As the diesel experts, we understand the concerns and problems faced by diesel car and truck owners. That's why we manufacture the products that protect your investment while helping you maximize your engine's efficiency.

Our products are designed to clean and protect your engine and ensure that it remains in top shape. From oil and fuel systems to hydraulic systems and transmissions, Hot Shot's Secret has a formula that will improve your engine's efficiency and performance, regardless of the way you use your vehicle, its age or the weather.

Ultra Premium DEF Fluid™

$24.99

ADVANCED PROTECTION, BUILT IN

Unlike standard or “premium” DEF products, Ultra Premium DEF™ doesn’t just slow crystal buildup… it cleans existing deposits which restrict flow, trigger fault codes, and reduce SCR efficiency. The result is improved reliability, fewer interruptions, and long-term SCR system protection. Ultra Premium DEF™ delivers the same performance benefits as Hot Shot’s Secret® Premium DEFender™, with added convenience thanks to the ready-to-use, pre-mixed formula.

The Problem: Regular DEF Stops at the “Standard”

Traditional DEF does one job: supply urea to the SCR system so it can help reduce NOx emissions. According to the American Petroleum Institute (API), Diesel Exhaust Fluid (DEF) is a 32.5% solution of technically pure urea in purified water, and it is injected into the exhaust stream where heat and catalyst activity convert NOx into nitrogen and water vapor.

That chemistry is essential, but it does not solve one of the biggest real-world problems diesel owners face: crystal buildup.

As DEF moves through the tank, pump, lines, injector, decomposition tube, mixer, and SCR system, it can leave behind white urea-derived crystal deposits. Those deposits can interfere with DEF delivery, restrict flow, affect injector spray pattern, trigger fault codes, reduce efficiency, and lead to downtime or expensive service.

Regular DEF meets the requirement. Ultra Premium DEF™ raises the bar.

Formulated with the highest-grade synthetic urea available, Ultra Premium DEF™ delivers like-new SCR system performance with continued use. This API-certified DEF is ISO 22241-compliant, and triple-filtered purity, Ultra Premium DEF™ doesn’t just fill your DEF tank, it protects the entire system.

Ultra Premium DEF™ is a step above every DEF on the market. It doesn’t just prevent problems – it helps correct them. By cleaning crystal buildup and protecting critical SCR component, Ultra Premium DEF™ helps restore performance, reduce fault codes and keep diesel equipment running the way it should.

100% Satisfaction Guaranteed!

No other performance chemical has a better guarantee than Hot Shot’s Secret. If any of our products do not deliver as promised, then we will give your money back.

Triple-Threat Testing Process
We understand what it’s like to be disappointed by products that do not live up to their claims. That’s why all Hot Shot’s Secret products are subject to rigorous, scientific, triple-threat testing:

(1) Testing in our world-class R&D lab.
(2) Independent, third-party testing.
(3) Real-world testing.

We know what the results are before you buy the product, ensuring that the product you purchase outperforms the other solutions on the market.

Real results from real people

“The Hot Shot products work just like Hot Shot says they do — even better than I would have expected. I have over 35 years’ experience in diesel truck maintenance as a mechanic, and for engine life longevity and minimizing the odds of problems, the Hot Shot program is part of my regular preventative maintenance.”

— Kenneth C.

Talk to an expert

800-341-6516