![]() If you use water instead of DEF, it will damage the exhaust passages and the SCR catalyst system as the minerals will react with the metal parts of the engine, and impact their longevity. Distilled water is different from deionized water.ĭeionized water does not contain minerals while distilled water contains minerals like magnesium and calcium. Even if you want to use distilled water instead of DEF, that will not be acceptable. Moreover, there will be excessive water in the combustion temperature which will affect the combustion temperature. This is because diesel exhaust fluid contains water and urea that forms crystals in the diesel fuel.Īs water is not soluble in diesel, mixing DEF with diesel fuel can also damage the fuel pump as it is not a good lubricant. These are totally different and each fluid has been formulated for a specific purpose.Īlso, don’t mix DEF with diesel. Here’s a video demonstration of the role of Diesel exhaust fluid in the SCR system of a diesel engine.Īlso, don’t confuse diesel exhaust fluid with transmission fluid, windshield fluid, or brake fluid. The SCR system is found on newer diesel engines that meet the stringent emissions regulations set by the Environmental Protection Agency (EPA). The diesel exhaust fluid is injected into the exhaust stream of the vehicle to remove pollutants like NOx by converting them to nitrogen gas and water. The appropriate consumption of DEF in Diesel Engines is around 2% of the diesel fuel used.ĭef runs through the selective catalytic reduction (SCR) system. DEF is 67.5 deionized water and 32.5% urea. Diesel exhaust fluid is also called AdBlue. 1. BlueDEF Diesel Exhaust Fluid By PEAKĭef is a diesel exhaust fluid that contains deionized water, urea, and a small proportion of other additives.Best Def Fluid For Cummins, Duramax and Powerstroke.
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