AdBLue
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AdBlue is a fluid used in many modern diesel vehicles to reduce harmful emissions, and if it runs out, your car may not restart. Stored in a separate tank with a blue filler cap, it is a non-toxic mixture of urea and deionised water that works by converting harmful nitrogen oxides in the exhaust into harmless nitrogen and water vapour through a system called Selective Catalytic Reduction (SCR). Most diesel vehicles, particularly those registered after 2015 from European manufacturers, use AdBlue, and it typically needs topping up between services depending on driving style and mileage.
How AdBlue Works
AdBlue is injected in small amounts into the exhaust system, where high temperatures convert it into ammonia and carbon dioxide. Inside the SCR catalyst, the ammonia reacts with harmful nitrogen oxide gases, breaking them down into harmless nitrogen and water, significantly reducing emissions and helping vehicles meet strict environmental standards such as Euro 6.
Running Low or Empty
If your AdBlue level becomes low, your vehicle will display warnings well in advance, usually starting at around 1,500 miles remaining. If ignored, engine performance may be reduced, and once the tank is empty, the vehicle will not restart after being switched off, so it is important to top up promptly when warned.
Checking and Refilling AdBlue
AdBlue is widely available from petrol stations, garages, and retailers, typically in 1.5, 5, or 10 litre containers, many with easy-pour systems. The filler cap is usually located next to the fuel cap, in the boot, or under the bonnet, and most vehicles require around 5 litres to refill. Always follow your vehicle handbook, avoid spills, and rinse any contact with paintwork, as AdBlue can cause damage despite being non-toxic.
Consumption and Usage
AdBlue consumption varies depending on the vehicle and driving style, but on average it is used at a rate of around 1 litre per 600 miles, although this can be higher. Depending on tank size and usage, most vehicles will require a top-up every 3,000 to 12,000 miles, meaning many drivers will need to refill between regular services.
Compatibility and Identification
Not all vehicles use AdBlue, but it is common in diesel models from brands such as Jaguar, Land Rover, and many French and German manufacturers. You can check if your vehicle uses AdBlue by consulting the handbook, looking for a blue filler cap, checking for ‘Blue’ or ‘SCR’ in the model name, or contacting a professional if you are unsure.
Warnings and Safety
Driving with an AdBlue warning light is not immediately dangerous, but ignoring it will eventually prevent the car from starting. There is no manual reset for the warning light, it will only clear once the system is refilled to the required level, so it is important not to delay topping up, especially before an MOT where emissions are tested.
Common Mistakes
Putting AdBlue into the diesel tank, or diesel into the AdBlue tank, can cause serious and costly damage to your vehicle’s systems. If this happens, do not start the engine and contact a professional immediately to prevent further damage and arrange safe draining and repair.
Need Help?
If you have any questions about AdBlue, need a top-up, or require assistance with your vehicle, get in touch with our team and we will be happy to help.
