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

Rislone's DEF Crystal Clean dissolves crystalized urea so your DEF system works as it should.

In this article we will look at how this system works, what it does, how it breaks and, lastly, what to do if/when it fails.

When DEF runs out or a system sensor fails, current systems can force a vehicle to drastically reduce speed or become ...

The EPA on Tuesday said new trucks won't derate due to DEF system faults nearly as quickly or severely, and announced plans to modify software on all existing trucks to extend the timing for derates.