Diesel Exhaust Fluid (DEF) is a urea based fluid designed specifically for use in SCR (Selective Catalytic Reduction) systems to reduce NOx emissions. Simply put, DEF is the solution to reduce truck / tractor emissions to meet the new EPA standards.
DEF is API certified and meets ISO22241 specifications. DEF is non-toxic, non-flammable, colorless, non-hazardous, and very easy to use. It is used in all diesel trucks and tractors that were manufactured in 2010 or later and have an SCR system.