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Diesel Emission Fluid (DEF) is a Urea-based fluid specifically engineered for diesel engines as the reducing agent in Selective Catalytic Reduction (SCR) systems, which is a new vehicle technology platform for reducing nitrogen oxide (NOx) emissions through exhaust aftermarket.
DEF is comprised of 32.5% high-purity Urea diluted in distilled water and stored onboard all diesel vehicles in a special independent tank. This fluid is pumped into the exhaust system st a rate of 2 to 4 ounces to a gallon of ultra low sulfur diesel fluid (ULSD) consumed. In the exhaust, this fluid is converted into ammonia and reacts with the NOx to produce reduced emissions and water vapor.