This is where the aforementioned selective catalytic reduction comes into play. Nitrogen oxides are harmful air pollutants. But it also combines with nitrogen in the exhaust stream to create nitrogen oxides. The excess oxygen creates more heat, which burns the soot. This gives them a high air-to-fuel ratio. Soot is a harmful air pollutant, so modern diesels are designed to run lean. It’s used in Selective Catalytic Reduction (SCR) to help lower diesel exhaust emissions.ĭiesel engines create soot during the combustion process. Diesel exhaust fluid, however, is odorless and colorless. Some prefer the term “DEF” because urea sounds like a different type of fluid - the stinky kind. DEF is basically an industry term for aqueous urea. Diesel Exhaust Fluid (DEF) is a chemical compound that combines high purity urea with deionized water.
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