Diesel exhaust fluid (DEF; also known as AUS 32 and sometimes marketed as AdBlue[3]) is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF …

Jul 29, 2024 · Who Needs DEF? Owners of vehicles with a diesel engine over 74 hp that also meets the 2010 EPA guidelines as part of the SCR reduction system must use DEF.

This article explains how DEF (Diesel Exhaust Fluid) works in conjunction with the SCR in diesel engines and how the EPA regulations affect truck owners.

We have DEF in any quantity you need. We also carry everything you need to get the fluid in your vehicle. With our collection of Lumax and Peak diaphragm pumps, flow meters, and dispense …

Apr 17, 2023 · DEF is made up of 67.5 percent deionized water and 32.5 percent high-purity urea. A quick internet search tells us there are roughly 100 American Petroleum Institute (API) …

Oct 8, 2025 · Since 2010, nearly all on-road diesel trucks and many types of nonroad equipment (such as tractors and construction machinery) have used DEF as part of selective catalytic …

Diesel exhaust fluids (DEF) help selective catalytic reduction (SCR) diesel engines meet the EPA’s near-zero emissions standards by lowering toxic nitrogen oxide exhaust levels as a …

Feb 18, 2011 · Diesel Exhaust Fluid is a nontoxic solution of 67.5% purified water and 32.5% ultra pure automotive grade urea. Diesel Exhaust Fluid is not a fuel or fuel additive.

DEF is not a fuel additive; instead, it is a precise mixture of urea and deionized water that is sprayed into the exhaust gas before entering the diesel engine’s SCR catalyst.

What does the abbreviation DEF stand for? Meaning: defendant; defense. How to use def in a sentence.