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Diesel Exhaust Fluid is formulated with 32.5 percent urea and 67.5 percent deionized water. In storage or when the engine is not in use, DEF will freeze at 12°F (-11°C). At this concentration level, the urea and the water freeze and thaw at the same rate – ensuring that you always have the correct amount of each.
How long does Diesel Exhaust Fluid Last It is crucial to buy a diesel exhaust fluid that complies with the International Organization for Standardization 22241 specifications. This will make sure that it is the right stuff and your vehicle will run right.