Diesel Exhaust Fluid or DEF, is a non-hazardous solution which is made up of 32.5 % urea and 67.5% de-ionized water.
Its purpose is to break down dangerous NOx emissions into harmless nitrogen and water by being sprayed into the exhaust stream of diesel vehicles. This system is called Selective Catalytic Reduction or SCR and can be found on 2010 and later model year trucks and cars. DEF is not a fuel additive and never comes into contact with diesel fuel. It is stored in a separate tank, typically with a blue filler cap.
Take care not to run out of DEF. Watch your dashboard warning lights. It will tell you when you are running low. If your vehicle is allowed to run out of DEF, the engines power may be reduced and vehicle speed limited until the DEF tank is refilled.
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