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 4, 2025 · Everything about diesel exhaust fluid (DEF) in one guide — how it works, refill frequency, freezing risks, and safe storage practices.

Jan 4, 2026 · ## What DEF fluid is and how it works DEF stands for Diesel Exhaust Fluid. It is an essential part of many modern diesel engines that use selective catalytic reduction (SCR) to …

Aug 19, 2025 · This article explains what diesel exhaust fluid, DEF for diesel trucks, its chemical composition, how the DEF system works, legal implications, maintenance, and more.

Dec 15, 2025 · In this article, we’ll break down what diesel exhaust fluid is, how it works within an SCR system, what it’s made out of, and why it’s used by nearly every modern diesel truck on …

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 …

This is where Diesel Exhaust Fluid (DEF) plays a critical role. By reducing harmful nitrogen oxide (NOx) emissions, DEF ensures that diesel engines meet stringent emission standards while …

Jan 5, 2026 · To combat this, modern diesel engines are equipped with emissions control technologies, including diesel exhaust fluid (DEF). This blog post will explore what DEF is, its …

Apr 2, 2024 · Diesel Exhaust Fluid (DEF) is a non-toxic, colorless liquid made of urea and deionized water. It’s injected into the exhaust stream of diesel engines to break down harmful …