How Often Should You Refill Automotive Urea?

[VonGabriel]

Automotive urea should be refilled approximately every 2000 kilometers, with 3 to 5 liters of urea consumed per 100 liters of diesel fuel. The urea consumption is roughly 3% to 5% of the diesel fuel usage. Automotive urea is a liquid used in SCR (Selective Catalytic Reduction) technology to reduce nitrogen oxide (NOx) emissions from diesel vehicles. It consists of 32.5% high-purity urea and 67.5% deionized water. The reason for adding automotive urea is that the primary harmful substances in diesel vehicle exhaust are nitrogen oxides and particulate matter. While particulate emissions can be reduced through technical means within the engine, the exhaust still contains significant nitrogen oxides. By injecting urea into the exhaust after-treatment system, the urea decomposes into ammonia at high temperatures, which then reacts with nitrogen oxides in the presence of a catalyst to produce harmless nitrogen gas and water.