Mercedes-Benz AdBlue Refill

AdBlue is a urea-and-demineralized-water solution. This substance is not only non-toxic but also colourless and odourless, as well as non-flammable. As a result of a chemical reaction, the nitrogen oxides in the exhaust are converted to harmless nitrogen and water vapour. Using Mercedes-Benz's BlueTEC technology, diesel engines can benefit from reduced emissions.

When your vehicle is serviced at an Approved Mercedes-Benz Retailer, the AdBlue tank is topped up. One litre of AdBlue is enough for approximately 625 miles of driving, and the AdBlue tank is large enough that you should not need to refill AdBlue between services. However, depending on the type of driving, mileage, and road conditions, AdBlue consumption may be higher.

When the AdBlue supply is down to about 3 litres, a message on the display will say 'refill AdBlue’. If the AdBlue tank is not topped up at this point – we recommend at least 3 litres – the message 'Refill AdBlue No start in XXX miles' will appear. You will be able to drive the distance indicated, but you will be unable to start the engine. If you intend to take your vehicle outside of Europe, we strongly advise you to have the AdBlue level checked by us.

If the AdBlue is not topped up and runs out, the message 'Refill AdBlue Start not possible' appears, and the engine will not start. To resolve this problem, you must add at least 3 litres of AdBlue. Customers with Roadside Assistance cover will receive a free 4 litre AdBlue top up at the roadside if their vehicle's AdBlue tank runs dry and fails to start.