How often should automotive urea fluid be refilled?

[JulietDella]

Automotive urea should be refilled approximately every 2000 kilometers, with 3 to 5 liters of urea used per 100 liters of diesel fuel. The consumption of urea is equivalent to 3% to 5% of the fuel consumption. Automotive urea is a liquid used in SCR (Selective Catalytic Reduction) technology to reduce nitrogen oxide pollution in diesel vehicle exhaust. It is composed of 32.5% high-purity urea and 67.5% deionized water. The reason for adding automotive urea is primarily to purify exhaust emissions. The harmful substances in diesel vehicle exhaust are mainly nitrogen oxides and particulate matter. While particulate emissions can be reduced through technical means within the engine, the exhaust primarily contains nitrogen oxides. By injecting urea into the exhaust after-treatment device, the urea decomposes into ammonia at high temperatures. Under the action of a catalyst, the ammonia reacts with nitrogen oxides to produce harmless nitrogen gas and water.