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.

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

2 days ago · Diesel Exhaust Fluid (DEF) is a consumable liquid required by most modern diesel engines using Selective Catalytic Reduction (SCR) technology. This specialized fluid is stored …

4 days ago · What is DEF? Learn why Diesel Exhaust Fluid is critical for your engine's power and how to avoid costly SCR system repairs.

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 …

Aug 1, 2025 · If you drive or work with modern diesel vehicles, you’ve probably heard about DEF, or Diesel Exhaust Fluid. But what is DEF exactly, and why is it so important?

Jul 4, 2025 · Diesel exhaust fluid (DEF) is a small part of your vehicle, but it plays a big role in keeping engines clean and compliant. In this guide, we’ll answer the most common questions …

May 27, 2025 · Learn what Diesel Exhaust Fluid (DEF) is, how it works, and why it’s essential for reducing emissions and improving diesel engine efficiency.

Apr 19, 2025 · The letters DEF stand for diesel exhaust fluid. Sometimes, you'll hear people refer to it as DEF fluid, and all three formats are acceptable. If you're interested in learning more …