Diesel Exhaust Fluid

CountryMark is a distributor of UltraPure, API-certified Diesel Exhaust Fluid. Diesel Exhaust Fluid, or DEF, is a special solution that plays an important role in helping you to protect the environment, in particular the quality of air we all breathe. Used in Selective Catalytic Reduction (SCR) systems of diesel-powered buses, cars and trucks, it changes nitrogen oxide emissions into nitrogen and water. That’s smart. And that’s why we only supply superior DEF that’s API-certified to be ultra-pure. Learn more below.

DEF FAQs

What is DEF and how is it used?

Diesel Exhaust Fluid (DEF) is an automotive grade of 32.5% urea mixed with 67.5% demineralized water. It’s nonhazardous, nontoxic and nonflammable.

How often will I need DEF?

DEF will be used at about 2%–3% of your diesel fuel consumption. So, every time you use 100 gallons of diesel fuel, you will need approximately 2–3 gallons of DEF.

Is DEF a fuel additive?

No. There is a separate tank for the fluid. DEF should not be added to the fuel tank.

What are the benefits of using DEF?

Diesel engines equipped with SCR using DEF not only meet the 2010 tailpipe standard, but they also deliver a significant fuel economy benefit.

Does it matter what DEF brand I purchase?

Yes, it does. UltraPure is an API-certified, ultra-pure, formaldehyde-free DEF. It is manufactured by Brenntag, the largest North American producer of DEF.

Who has selected UltraPure?

UltraPure is the factory fill and dealership choice for Volvo Trucks North America, Mack Trucks, Daimler Trucks North America, Freightliner, Ford, GM, Chrysler and Hino, to name a few.

Do you have package products or bulk DEF?

UltraPure is available in: Cases of two 2.5-gallon jugs, 55-gallon drums, 330-gallon totes, and bulk.

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