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GoVets offers Automotive Chemicals in the Fleet and Vehicle Maintenance category to help customers complete their projects. Diesel Exhaust Fluid (DEF) is a non-toxic, colorless, odorless, and non-flammable fluid that is used in diesel engines to reduce emissions of nitrogen oxides. DEF is injected into the exhaust stream of diesel engines to break down harmful pollutants into nitrogen, water, and carbon dioxide. Shop today to find the right DEF for your project.