![]() It injects the DEF through a catalyst and into the exhaust stream, where the DEF starts a chemical reaction, turning the nitrogen oxide into nitrogen, water, and some carbon dioxide. ![]() This emissions control technology is what uses DEF and allows it to interact with the engine’s exhaust. What Is Selective Catalytic Reduction?Īnother common acronym you will find surrounding DEF is SCR, or selective catalytic reduction. DEF is the reducing agent in the chemical reaction that occurs in selective catalytic reduction (SCR) systems. This fluid is an essential part of ensuring that heavy-duty trucks and machinery operate within federal emissions standards set by the Environmental Protection Agency (EPA). Those requirements mean that DEF is a widespread substance used with nearly every diesel engine out there. Essentially, DEF is a key ingredient in starting the chemical reaction that keeps dangerous gases produced during diesel engine operation out of our environment. ![]() These substances help turn nitrous oxide - a harmful type of emission from diesel engines - into water and nitrogen, two everyday substances that make up the air we breathe. What Is DEF?ĭEF is made up of deionized water and urea. Fortunately, modern technologies have made DEF systems pretty user-friendly. Without that knowledge, you could end up with an engine that does not start up after your next pit stop. It’s vital to understand the role it plays in the operation of your diesel equipment. DEF, or diesel exhaust fluid, is a ubiquitous component of almost every type of diesel-powered engine used in the United States. If you’ve come across the term “DEF” and wondered what it is or had any questions about its use, you’re in the right place.
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