Diesel Exhaust Fluid, DEF, sometimes known as urea, is a component of catalytic reduction (SCR) systems, which help diesel vehicles meet stringent emission regulations.
Diesel Exhaust Fluid, DEF, is sometimes known as urea.
Urea is a nitrogen-containing compound that turns into ammonia when heated.
Urea occurs naturally however it can be manufactured from natural gas.
Current DEF formulations are nontoxic, colorless, and odorless.