Diesel exhaust fluid - Wikipedia

SwRI wins R&D 100 Award for Catalyzed Diesel Exhaust Fluid technology

Diesel exhaust fluid is one of the key elements of the Selective Catalytic Reduction SCR process used by most medium and heavy-duty engine builders to meet EPA 2010 regulations. BlueDEF is a non-toxic solution of 67.5 percent purified water and 32.5 percent ultra pure automotive grade urea. BlueDEF is not a fuel or fuel additive.

Blue DEF Diesel Exhaust Fluid - 2.5 gallon

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Detroit Diesel DD13, DD15, DD16 Exhaust, EGR, Aftertreatment Service Manual CD

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Diesel exhaust - Wikipedia