Why is Urea Added to Vehicles?

3 Answers
LaJohn
07/29/25 8:03am
Below are the reasons why vehicles need urea: 1. Diesel engines emit harmful nitrogen oxide gases during operation: These gases are hazardous to both the atmosphere and human health. Prolonged exposure to such gases can lead to respiratory diseases. To mitigate the impact of these gases on the atmosphere and human health, urea is used. 2. When urea encounters nitrogen oxide gases emitted by diesel engines: A chemical reaction occurs, converting nitrogen oxide into nitrogen and water, which are then expelled. Below are the effects of not using urea in diesel vehicles: 1. The power and fuel consumption of diesel vehicles will be negatively affected, either decreasing or increasing; 2. It can cause the vehicle's engine to automatically reduce speed; 3. It may interfere with the catalyst in the SCR catalytic reaction tank, potentially damaging the post-treatment equipment.
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MacHayden
08/12/25 11:15am
I've been driving a diesel car for several years and found that adding urea is mainly for environmental protection. Nowadays, many diesel vehicles use SCR systems to treat exhaust emissions. The urea solution is injected and decomposes at high temperatures to produce ammonia, which reacts with harmful nitrogen oxides to form nitrogen and water. This significantly reduces emissions, meeting strict exhaust regulations. If you don't add it, the car might show a warning light or even go into reduced power mode. I remember the new car manual reminding to add special urea fluid every 5,000 kilometers on average, with a blue filler port at the rear of the car. It's important to check regularly while driving and not wait until it's empty. This stuff is cheap and effective, protecting the air and making driving smoother. Car owners should understand their vehicle's requirements to avoid major issues over minor neglect.
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LaMicah
08/12/25 11:16am
From a pollution reduction perspective, adding urea is extremely important. I consider it a green essential for modern diesel vehicles. The principle is simple: urea helps the SCR system break down nitrogen oxides in exhaust gases, converting them into harmless components. Not adding it not only violates environmental regulations but also allows pollutants to be directly emitted into the air, affecting health. I know both Europe and China have strict standards that compel automakers to adopt this technology. As someone who loves the planet, I recommend everyone not to skip this step and add it on schedule. The amount used depends on mileage, and generally, ready-made AdBlue is sufficient. Don’t forget, adding it to the wrong location can damage the vehicle. Consistently taking this small step can make a big contribution to blue skies. When driving, seeing clearer exhaust emissions brings peace of mind.
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