Do China IV Diesel Vehicles Require Urea?

[Jenkins]

China IV diesel vehicles require urea. Urea is essential: With the improvement of national emission standards, vehicle urea has become a necessary consumable, just like engine oil and lubricants today. Urea standards: In China, qualified urea solution is the standard, generally composed of 32.5% ultra-pure urea and pure water to synthesize NOX. The urea solution reacts with NOX to produce nitrogen, oxygen, and water, thereby reducing nitrogen oxide emissions. This method is applicable to every Euro IV and Euro V diesel engine SCR system. Hazards of inferior urea: The power and fuel consumption of diesel vehicles are affected by urea. If a diesel vehicle does not have an exhaust treatment device or uses inferior products, it will cause the vehicle's engine to automatically decelerate and also affect the catalyst in the SCR catalytic reaction tank.

[McAmy]

As a veteran driver who's been operating a China IV diesel vehicle for years, I must tell you that AdBlue is absolutely mandatory. The China IV emission standards require diesel vehicles to use Selective Catalytic Reduction (SCR) systems, which rely on urea to process nitrogen oxides in exhaust gases. If you skip the AdBlue, the SCR system becomes ineffective, triggering engine torque limitation - your vehicle will lose power while burning more fuel. In my routine maintenance, I refill a 10-liter AdBlue tank every 5,000 to 10,000 kilometers at a cost of around 50 RMB. However, skipping this could cost you thousands in SCR component repairs, not to mention potential traffic police fines. Bottom line: don't penny-pinch on this – develop the habit of regularly checking your AdBlue tank level to avoid major headaches.

[McAmir]

I remember my National IV diesel pickup truck. In the first year, I neglected the urea issue, which resulted in the SCR component burning out. The mechanic said the system relies on urea to purify exhaust gases, and not adding it would cause carbon deposits to accumulate, leading to malfunctions. Nowadays, National IV vehicles generally come with a urea tank, designed specifically to reduce emissions. If the urea level gets low, a warning light will illuminate on the dashboard, reminding you to refill promptly. I use the commonly available AdBlue brand in the market, and the operation is straightforward—the filler port is next to the fuel tank. If you skip adding it, not only will it fail to meet environmental standards, but it will also accelerate engine aging and double the maintenance costs. It's really not worth the risk.

[MacIsabela]

When I first got into China IV diesel vehicles, I also wondered whether to add urea. Later, after studying the vehicle manual, I learned that the China IV standard strictly requires a urea system—it's a must. In actual use, the SCR function relies on urea to break down harmful substances in the exhaust. Without it, excessive emissions can damage the vehicle and pollute the air. I tried skipping urea a few times, and the vehicle noticeably lost power. My advice to beginners: regularly check the urea level and don’t wait until the system locks out to regret it.