Can different brands of urea be mixed?

[Athena]

Different brands can be mixed, but it is not advisable to do so for a long time. Definition of automotive urea: Automotive urea is a liquid used in SCR technology to reduce nitrogen oxide pollution in diesel vehicle exhaust. Its composition is 32.5% high-purity urea and 67.5% deionized water. Reason for adding automotive urea: The main harmful substances in diesel vehicle exhaust are nitrogen oxides and particulate matter. While particulate emissions can be reduced through technical means inside 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, which reacts with nitrogen oxides in the presence of a catalyst to produce harmless nitrogen and water.