DEF itself is a solution of 32.5 percent urea and 67.5 percent deionized water. The heat of the exhaust breaks this solution down into ammonia, which reacts with the NOx turning it into nitrogen ...

For most diesel-powered engines, DEF is vital so the vehicle performs at its best. Here's what it is exactly and what the acronym stands for.

Diesel exhaust fluid is the primary solution used in NOx aftertreatment. Most diesel vehicles today cannot legally operate without DEF. But what is NOx, and why do fleets need DEF to treat it?

Given how important the fluid is, you don't want your diesel-powered vehicle to run on expired DEF. Long-term use of expired DEF can significantly affect the performance of the selective catalytic ...

Diesel exhaust fluid is a mixture of synthetic, high-purity, automotive-grade urea and deionized water. This liquid is clear, nontoxic, nonflammable, non-explosive, and generally nonhazardous.

09 Tariffs Explained: What It All Means for You AI. ChatGPT 3.5 ... From the particulate filter, the exhaust gas travels past a nozzle which sprays diesel exhaust fluid into the stream of gases.

Diesel Exhaust Fluid (DEF) is a crucial component in modern diesel vehicles, introduced to comply with US Environmental Protection Agency (EPA) regulations that began in 2010. It's a solution made ...

As seen in the following four-minute video, maintenance tips include how to refill the Diesel Exhaust Fluid, or DEF, ... 2025 Chevy Traverse Drive Modes Explained .