What is Diesel Exhaust Fluid (DEF)?
Diesel Exhaust Fluid (DEF) is a non-hazardous solution that is comprised of 32.5% urea and 67.5% de-ionized water. DEF is sprayed into the exhaust stream of diesel vehicles or machinery to break down dangerous NOx emissions into harmless nitrogen and water. This system is called Selective Catalytic Reduction (SCR) and can be found on 2010 and later model year trucks and many diesel pickups and SUV's. DEF is NOT a fuel additive and never comes into contact with diesel. It is stored in a separate tank, easily distinguished by its blue filter cap.
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