Diesel exhaust fluid - Wikipedia
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 Is DEF and How Does It Work? - MotorTrend
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.
What Is Diesel Exhaust Fluid and How Does It Work?
Dec 14, 2025 · Demystify Diesel Exhaust Fluid (DEF). We explain its regulatory role, the chemical reaction that cleans emissions, and handling requirements.
Diesel Exhaust Fluid (DEF) Guide: Uses, Risks & Storage
Jul 4, 2025 · Diesel Exhaust Fluid (DEF) is a non-toxic mix of 32.5% urea and 67.5% purified water. It’s used in modern diesel engines with Selective Catalytic Reduction (SCR) systems to …
What is DEF? How Does DEF Fluid Work in Diesel Engines
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 …
Diesel Exhaust Fluid Explained: What Is DEF & Why It Matters
Dec 9, 2025 · 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 …
What Is Diesel Exhaust Fluid (DEF)? A Trucker's Guide to How It …
Diesel exhaust fluid (DEF) plays a critical role in keeping modern diesel trucks compliant with emissions standards. Every trucker operating a 2010 or newer diesel engine needs to …
Diesel Exhaust Fluid: Everything You Need to Know
Feb 10, 2025 · It’s called DEF for short, but the very first thing you may be wondering is what on earth is diesel exhaust fluid, and the answer is quite simple: it’s a fluid that gets injected into …
Diesel Exhaust Fluid: What It Is, How It Works & Importance
Jun 26, 2025 · Diesel Exhaust Fluid, or DEF, is a non-toxic, colorless solution composed of 32.5% urea and 67.5% deionized water. It’s specifically designed to reduce harmful emissions from …
What does diesel exhaust fluid do & what happens if you run …
Diesel engines can be more efficient than gasoline engines, but that's largely due to DEF. Here's what it does, how it helps, and what happens if you run out.