Time to Clean The new Rislone DEF Crystal Clean™ Diesel DEF & SCR Emissions System Cleaner does exactly what you think it should. It cleans your DEF system, dissolving the crystalized urea.

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

Diesel exhaust fluid or DEF is a mixture of industrial urea and deionized water. The solution is designed to work with selective catalytic reduction (SCR) systems in order to cut down on diesel ...

It works with SCR systems to convert toxic pollutants like nitrous oxides into innocuous products like water vapor and nitrogen.

RELATED: EPA Sets Strict Emissions Standards for Heavy Trucks The systems thus far have de­pended on hot exhaust to work. This means the basic SCR system works well when the engine is under load ...