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Get guaranteed purity from America’s #1 DEF brand.

We test each batch of BlueDEF® before we put our name on it. Our batch code, found on each package of BlueDEF®, is your assurance that the diesel exhaust fluid within is pure and has been tested to meet or exceed the strictest OEM standards.


What Does Diesel Exhaust Fluid Do?

Diesel Exhaust Fluid is sprayed into the diesel exhaust streams of diesel engines to lower the concentration of nitrogen oxide, NOx, in emissions.

Why BlueDEF® Diesel Exhaust Fluid?

Engineered for use in Selective Catalytic Reduction (SCR) systems on diesel engines, BlueDEF® diesel exhaust fluid is comprised of a high-purity synthetic urea and deionized water mixture that improves emissions and fuel economy.
For more on BlueDEF® diesel exhaust fluids, check our the BlueDEF FAQs

How Diesel Exhaust Fluid Works?

When injected into the exhaust stream with a specialized dosing module, BlueDEF®’s water vaporizes, leaving ammonia molecules en route to the catalytic converter; once there, it converts NOx molecules into harmless nitrogen and water vapor—making for cleaner emissions. To ensure Selective Catalytic Reduction (SCR) performance, diesel exhaust fluids must adhere to the ISO 22241 Standards.

For more on diesel exhaust fluid, read about DEF solutions.

What is DEF Fluid Made Of?

Diesel Exhaust Fluid (DEF) is made with 32.5% urea, (NH2)2CO, and 67.5% deionized water. Diesel Exhaust Fluid (DEF) is non-toxic and safe to handle, but it can corrode some metals, so it must be stored and transported carefully.

Where Can I Buy BlueDEF Diesel Exhaust Fluid?

BlueDEF® Diesel Exhaust Fluid is available at major retailers and through your parts & supplies distributor