Why do some China V vehicles not use urea?

[AaliyahDella]

Because urea is primarily used for diesel engines, some China V vehicles do not require urea. Below are the relevant details: 1. Introduction to automotive urea: The technical name for automotive urea is Diesel Exhaust Fluid (DEF). It is commonly used in diesel engines as part of SCR (Selective Catalytic Reduction) technology to reduce nitrogen oxide (NOx) emissions from diesel vehicles. Its composition consists of 32.5% high-purity urea and 67.5% deionized water. 2. Reason for adding urea in diesel engines: During operation, diesel engines emit harmful nitrogen oxide gases, which are damaging to both the atmosphere and human health. Prolonged exposure to these gases can lead to respiratory diseases. To mitigate these effects, when urea encounters nitrogen oxides emitted by diesel engines, a chemical reaction occurs, converting the nitrogen oxides into harmless nitrogen gas and water vapor.