Why Do Modern Diesel Vehicles Require Urea?
2 Answers
Modern diesel vehicles require urea to reduce exhaust emissions and protect the atmospheric environment. Urea is used to convert harmful nitrogen oxides in the exhaust into nitrogen and water. The exhaust emitted by diesel engines significantly pollutes the atmosphere, and as environmental regulations become increasingly stringent, exhaust treatment systems have been introduced to ensure compliance. Automotive urea is a liquid used in Selective Catalytic Reduction (SCR) technology to reduce nitrogen oxide pollution in diesel exhaust. It consists of 32.5% high-purity urea and 67.5% deionized water.
As someone who has been in the auto repair industry for many years, I often encounter diesel vehicle owners asking about this. Modern diesel vehicles are generally equipped with an SCR system, which requires a substance called urea solution to function. Simply put, urea is injected into the exhaust pipeline to specifically eliminate harmful gases produced by diesel combustion, such as nitrogen oxide pollutants. If not added, the SCR system fails, leading to increased toxic emissions. This not only violates environmental regulations and results in fines but may also force the vehicle into limp mode, drastically reducing power and making driving dangerous. Worse yet, long-term neglect can cause catalytic converter damage, with repair costs being alarmingly high. We always remind vehicle owners during repairs to regularly add AdBlue or similar products, just like refueling. Check every 5,000 kilometers or so, depending on the vehicle manual. The benefit is that adding urea ensures emissions compliance and extends engine life. Remember, never substitute professional solution with ordinary urea, as it can damage the vehicle. In short, this is a mandatory practice for modern diesel vehicles—safety first.
