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Diesel Exhaust Fluid, 2.5-Gallons

Blue Def is stable, colorless, non-flammable, non-toxic, and is classified as a minimum risk for transportation. Conforms to the ISO-22241-1 specification for DEF, is API registered, and meets or exceeds OEM specifications. Blue Def is a mixture of 32.5% high purity synthetic urea and 67.5% deionized water that is used in Selective Catalytic Reduction (SCR) systems on diesel engines.

DEF is the primary ingredient used to help convert NOx to harmless nitrogen and water.