Dean's Bulk Service


Call: 1-800-548-2799

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What is DEF and why is it used?

What is DEF and why is it used?

Diesel Exhaust Fluid (DEF) is a urea based fluid designed specifically for use in SCR (Selective Catalytic Reduction) systems to reduce NOx emissions. Simply put, DEF is the solution to reduce truck / tractor emissions to meet the new EPA standards. Diesel Exhaust Fluid is a non-toxic solution engineered to help diesel-powered vehicles reduce emissions and improve fuel economy.

Why DEF? The Environmental Protection Agency requires all 2010 on-highway diesel engines to meet new Nitrogen Oxide (NOx) emission standards.

How it 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


SDS Safety Data Sheets available on the link below:

Sales Contacts

Our territories include:

Western Minnesota, all of North Dakota, the Eastern half of South Dakota, and Northwestern Iowa


Use the form below to request a DEF delivery information. We will get back to you as soon as possible.

Street Address

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