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What is AdBlue and how does it differ from other additives?
AdBlue is an aqueous solution made up of 32.5% high-purity urea and 67.5% demineralised water. It's worth being clear from the outset: AdBlue is neither a fuel nor a fuel additive. It's a reducing agent that is injected into the exhaust system of diesel vehicles equipped with SCR (Selective Catalytic Reduction) technology.
Unlike other additives that boost engine performance, AdBlue is never mixed with the fuel itself. Its primary purpose is to reduce harmful emissions — particularly nitrogen oxides (NOx) — by converting them into nitrogen and water vapour, both of which are harmless to the environment.
How does AdBlue work in diesel cars?
The emission reduction process that AdBlue enables is a clever piece of chemistry. As exhaust gases leave the engine, they pass through the SCR catalytic converter, where AdBlue is injected. The intense heat of the exhaust triggers a chemical reaction that breaks down the urea in AdBlue into ammonia.
This ammonia then reacts with the NOx inside the SCR catalyst, transforming them into nitrogen and water vapour — which are released into the atmosphere without causing any harm.
Why is it important for diesel vehicles?
AdBlue plays a fundamental role in modern diesel vehicles for several reasons:
Meeting emissions regulations
In recent years, vehicle emissions regulations have become increasingly stringent. The Euro 6 standard — currently in force across Europe — sets very low limits on NOx emissions from new diesel vehicles.
Euro 6 standards and their impact on diesel vehicles
SCR technology combined with AdBlue has become the most effective solution for vehicle manufacturers to comply with Euro 6 requirements. Without AdBlue, modern diesel vehicles simply would not be legally allowed on our roads.
Environmental benefits
By significantly cutting NOx emissions, AdBlue helps improve the quality of the air we breathe. NOx gases are harmful pollutants that contribute to smog formation, acid rain and respiratory problems.
Using AdBlue in your diesel vehicle is a simple but genuinely effective way to reduce your environmental footprint and play your part in a more sustainable future.
When and how should you top up AdBlue?
Most modern diesel vehicles have a dedicated AdBlue tank, and a dashboard warning light will alert you when the level is running low. It's important not to ignore this warning — driving without AdBlue can affect engine performance and may even immobilise the vehicle entirely.
You can top up the AdBlue tank yourself at a service station. We recommend consulting your vehicle's owner manual to find out where the tank is located and how to fill it correctly.
Tips for using AdBlue correctly
To get the most out of AdBlue and keep your vehicle running smoothly:
- Always use high-quality AdBlue: Make sure you purchase AdBlue from a trusted service station like Moeve — the purity of the product is essential for the SCR system to work properly.
- Never mix AdBlue with other additives: AdBlue must be used undiluted. Mixing it with other products can damage your vehicle's SCR system.
- Store AdBlue properly: Keep it in a cool, dry place, away from direct sunlight.
- Check your AdBlue level regularly: Don't wait for the warning light to come on. Keeping an eye on the level will help you avoid any unwanted surprises on the road.
Frequently asked questions about AdBlue
Does it affect engine performance?
AdBlue has no negative impact on engine performance. In fact, by ensuring the SCR system functions correctly, it actually helps keep the engine clean and running efficiently.
Can I drive without AdBlue if it runs out?
It's not advisable. If the AdBlue level drops too low, your vehicle's emissions control system may limit engine performance — or even prevent the engine from starting altogether.
Do all diesel cars need it?
Not all diesel vehicles require AdBlue — only those fitted with SCR technology. If your diesel car was manufactured before Euro 6 came into force, it most likely doesn't need it.
In short, AdBlue is an essential component for modern diesel vehicles. It not only allows them to meet emissions regulations, but also plays a meaningful role in protecting the environment. Use it correctly and keep the tank topped up to enjoy efficient, responsible driving.
Find out more
You can read the full EU regulations on light vehicle emissions in Regulation EU 2017/1154 on EUR-Lex:
https://eur-lex.europa.eu/legal-content/ES/TXT/PDF/?uri=CELEX:32017R1154
