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 is an aqueous urea solution made with 32.5% urea and 67.5% deionized water.

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.

Jul 29, 2024 · Diesel exhaust fluid, or DEF, is a key component in lowering pollutants emitted from diesel engines, helping to improve efficiency and reduce emissions.

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 so many brands available, understanding what DEF does, how it works, and how to store it properly is key to keeping your diesel running smoothly.

Apr 13, 2018 · DEF is "Diesel Exhaust Fluid" and, as a matter of fact, modern diesels run just fine without it. DEF is instead concerned with what comes out of modern diesel engines. Diesels burn really...

Diesel Exhaust Fluid (DEF) is a key component used in vehicles equipped with Selective Catalytic Reduction (SCR) technology. This technology is designed to reduce harmful emissions by breaking down nitrogen oxides (NOx) into harmless nitrogen and water.

Jun 28, 2021 · What Is Diesel Exhaust Fluid (DEF)? The purpose of DEF is to neutralize nitric oxide and nitrogen dioxide in diesel fuel exhaust. These compounds, together known as NOx, are toxic to humans.

Diesel Exhaust Fluid (DEF) is used in diesel engines with SCR systems to reduce emissions. As the world's largest DEF producer, Yara offers the security of supply and reliable quality DEF.

Diesel Exhaust Fluid, often abbreviated as DEF, is a non-toxic, colorless, and odorless solution composed of purified water and urea. It is injected into the exhaust stream of diesel engines equipped with Selective Catalytic Reduction (SCR) systems.

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 vehicles to significantly reduce engine emissions, particularly nitrous oxide as well as particulate matter.