DEF or Diesel Exhaust Fluid

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 non-toxic, colorless, and odorless.