The first clue that your car is running low on AdBlue is that you’ll see a warning light in the instrument cluster. Only very small amounts of AdBlue are used, so a refill is a rare occurrence. A diesel Volkswagen Passat, for instance, takes about 8,000 miles to empty its 13-litre AdBlue tank. And a diesel Peugeot’s tank is refilled when it’s serviced every 12,500 miles. However, the rate at which your car consumes AdBlue is affected by your driving style, what types of journey you do and the conditions in which you drive. In that way, AdBlue is much like fuel. AdBlue is fed into a car’s exhaust system where it reacts with the NOx in the exhaust gases. NOx is a waste product of the combustion process, along with carbon dioxide and many other chemicals.

The low AdBlue light generally comes on when there’s around 1,000 to 1,500 miles left in the tank, so you have plenty of time to top it up. Scroll through your car’s trip computer and you should find an AdBlue gauge. How do I refill my car’s AdBlue tank? AdBlue goes into a tank underneath your car and is injected into the exhaust system to remove NOx from the exhaust gases. You can buy AdBlue in containers and many fuel stations have pumps. How does AdBlue work?