Diesel Exhaust Fluids (DEF)
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Diesel exhaust fluids (DEF) help selective catalytic reduction (SCR) diesel engines meet the EPA’s near-zero emissions standards by lowering toxic nitrogen oxide exhaust levels as a vehicle is operated. Use of this fluid is mandatory in these diesel engines operating on U.S. roads and on farmlands.
Diesel Exhaust Fluids (DEF)
DEF is a mixture of synthetic urea and water that is added to diesel exhaust systems to lower or remove toxic nitrogen oxide emissions. It is nontoxic but will freeze in temperatures under 12°F and can corrode aluminum or carbon steel containers if stored improperly.
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