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 …

What exactly is Diesel Exhaust Fluid (DEF)? From a strictly chemical disposition DEF is a mixture of 67.5% deionized water and 32.5% urea. Urea is a compound in Nitrogen that turns to …

Jul 29, 2024 · DEF is a key component in lowering pollutants emitted from diesel engines, helping to reduce harmful emissions. Long-haul truckers and diesel engine enthusiasts had to rethink …

Apr 26, 2023 · Diesel exhaust fluid (DEF) is a non-hazardous solution used within a selective catalytic reduction (SCR) system to break down harmful pollutants (NOx) generated by a …

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.

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) …

Dec 9, 2024 · The DEF system is directly connected to the engine and specifically designed to reduce emissions from the diesel engine’s exhaust. DEF is injected into the exhaust system, …

Feb 10, 2025 · DEF is essential for reducing emissions in trucks made after 2010, and choosing a high-quality DEF product can help maintain efficiency and prevent contamination issues. With …

The API Diesel Exhaust Fluid (DEF) Certification Program is a voluntary program designed to certify and monitor the quality characteristics of diesel exhaust fluid intended for use in motor …

DEF, an acronym for Diesel Exhaust Fluid, is the trucking industry’s response to U.S. Environmental Protection Agency standards requiring all medium and heavy-duty diesel …