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Diesel Exhaust Fluid (DEF)
Diesel Exhaust Fluid (DEF) is a dilute urea solution made with 32.5% urea and 67.5% deionized water. It is used in modern diesel engines to reduce nitrogen oxides that are produced during combustion. Diesel Exhaust Fluid is a dilute urea solution made with 32.5% urea and 67.5% deionized water. It is used in modern diesel engines to reduce nitrogen oxides that are produced during combustion.