Glossary / General

diesel exhaust fluid

11 Episode Mentions

Too Afraid to Ask

Diesel exhaust fluid is a special liquid that helps clean up the smoke from diesel engines. It makes the air cleaner by turning bad gases into safe ones.

Technical Definition

Diesel exhaust fluid (DEF) is a liquid used in diesel engines to reduce emissions of nitrogen oxides (NOx). It is injected into the exhaust stream to help convert harmful pollutants into harmless nitrogen and water.

Hear It Discussed

"...because they're eliminating diesel exhaust fluid that's what i mean by lower cost of uh oh yeah that's possible um that's what that would be that would be bad diesel exhaust fluid it works it..."
RTR Spec 5 Review; Way-mo Problems; Odometer Rollbacks The Smoking Tire 54:40

"The death fluid is made up primarily of water, DI&I's water, and urea. So you're basically like steam cleaning your exhaust. ... And it just helps complete that combustion process and scrub it."
Save Money On Car Repairs With Our Car Talk Show Under The Hood show 03:13

"...on this exact topic on what to look for in the future as far as diesel exhaust fluid. And what we have found is that the issue...goes wrong the most with the death is the sensor..."
Car Pro Radio Show May 2 26 Hour 1 CarPro Radio Show 23:39