In recent years, the term car urea has become increasingly common, especially among diesel vehicle drivers. But do you really know what is urea in a car, how it works, and why it’s so important? In this article, we explain how it helps reduce harmful emissions and what happens when it runs out.
What is urea in a car and why is it important?
Automotive urea, also known as AdBlue or DEF (Diesel Exhaust Fluid), is a liquid made of 32.5% synthetic urea and 67.5% deionized water. This additive is essential for modern diesel vehicles that comply with Euro 6 standards.
Its main function is to reduce nitrogen oxide (NOx) emissions, which are highly polluting. Urea is injected into the exhaust system, where it undergoes a chemical reaction that transforms these gases into nitrogen and water vapor, which are harmless to the environment.
Why is urea essential in diesel vehicles?
- It complies with European emission regulations.
- It significantly reduces NOx pollution.
- It protects the engine and exhaust system by preventing harmful buildup.
- It’s an essential part of the SCR (Selective Catalytic Reduction) system.
What does urea do in a vehicle?
Urea in the car works alongside the SCR system. Once injected into the exhaust, it turns into ammonia, which reacts with NOx gases and converts them into non-toxic components. This process occurs before the gases reach the catalyst, improving the efficiency of the emission reduction system.
What happens if the car runs out of urea?
If the urea tank is empty, the vehicle cannot perform the emission reduction process. This activates a safety or emergency mode that may limit engine power or even prevent the car from starting.
That’s why it’s crucial to check AdBlue levels regularly and refill on time. Many AdBlue home delivery services let you refill without visiting a garage.
What is the difference between urea and AdBlue?
Although many people use the terms urea and AdBlue interchangeably, there is a technical difference:
- Urea: The main chemical compound in the solution.
- AdBlue: The commercial name of the urea and deionized water solution, registered by the German Association of the Automotive Industry (VDA).
In short: AdBlue is the commercial format used to deliver urea into a diesel vehicle’s exhaust system.
How much does it cost to replace a urea tank?
The cost of replacing a urea tank varies by vehicle make and model. On average:
- Small tanks: Start around €250.
- Large or integrated tanks: Can exceed €800, including labor.
That’s why preventive maintenance and using quality AdBlue is key. You can also find services like home diesel delivery that offer AdBlue refills directly at your location.
Where is the urea tank located in the car?
The AdBlue tank is usually located near the fuel tank or in the trunk and is easily identified by its blue cap. Some models also display the level on the dashboard.
When and how should urea be refilled?
AdBlue consumption depends on the driving style and vehicle model. Generally:
- 1 liter lasts for 1,000 to 1,500 km.
- Average tank capacity ranges from 10 to 20 liters.
- Most vehicles alert you when levels are low.
For convenience, consider services like diesel delivery in Granada that offer on-site AdBlue refills.
Visit our blog to read more articles like Tarjeta Gasóleo Bonificado: What it is and how to apply.
Knowing what is urea in a car and keeping it topped up is essential to protect your engine and the environment. Stay up to date with maintenance and avoid future issues.
Frequently Asked Questions
Can I keep driving if I run out of urea?
No. The vehicle may limit its power or fail to start once the system detects an empty urea tank.
Does AdBlue expire?
Yes. It has a shelf life of 12 to 18 months if stored properly—away from heat and sunlight.
Which vehicles use urea?
All diesel vehicles that comply with Euro 6 and have an SRC system require AdBlue or urea.
Can I refill AdBlue myself?
Yes, you can use certified products for self-refilling. However, for convenience and safety, many choose AdBlue home delivery.
