You and AdBlue®

Mercedes-Benz You and AdBlue

Mercedes-Benz BlueTEC technology has been developed to ensure Mercedes-Benz diesel models meet specific environmental standards whilst maintaining vehicle performance.

Mercedes-Benz diesel engine vehicles carrying BlueTEC badges use AdBlue technology to help reduce the amount of harmful nitrogen oxides found in the vehicles' emissions.

Further details on AdBlue can be found below. However, if you cannot find the information you are looking for, please contact your local Mercedes-Benz Retailer.

You and AdBlue.

Your vehicle's AdBlue is topped up for free in its first year, after that the top up service is completed free of charge when AdBlue is purchased from your local Mercedes-Benz Retailer.

1. What is AdBlue and how does it work?

AdBlue is a solution composed of urea and demineralised water. It is non-toxic, colourless, odourless and non-flammable.

AdBlue is injected into the engine’s exhaust gases by the BlueTEC system and in the resulting chemical reaction, the nitrogen oxides in the exhaust are converted into harmless nitrogen and water vapour.

Mercedes-Benz BlueTEC technology enables diesel models to benefit from reduced emissions whilst maintaining performance in relation to power and torque output.

2. How often does AdBlue need to be topped up / replaced?

Your vehicle's AdBlue tank will be topped up each time your vehicle is serviced at an Approved Mercedes-Benz Retailer. One litre of AdBlue is sufficient for approximately 625 miles of driving and the size of the AdBlue tank has been designed so that you should not have to refill AdBlue between services. However, AdBlue consumption may be higher depending on the type of driving, mileage and road conditions.

3. How will I know when it is time to top up?

When the AdBlue supply is down to approximately 3 litres, a display message reading 'refill AdBlue' will appear.

If the AdBlue tank is not topped up at this point – we recommend a minimum top up of at least 3 litres - the 'Refill AdBlue No start in XXX miles' message will appear. You will be able to drive the distance shown but you will subsequently be unable to start the engine.

If you are planning to take your vehicle outside Europe, we strongly recommend that your vehicle’s AdBlue level is checked at an Approved Mercedes-Benz Retailer.

4. What happens if AdBlue runs out?

If the AdBlue is not topped up and is allowed to run out, the message 'Refill AdBlue Start not possible' will appear, and the engine will not start. In order to resolve this issue, you must top up with at least 3 litres of AdBlue.

If a vehicle's AdBlue tank runs empty and fails to start, customers with Roadside Assistance cover will receive a free 4 litre AdBlue top up at the roadside.

5. Where can I buy replacement AdBlue from?

Containers of AdBlue are available from your local Mercedes-Benz Retailer. The containers are simple and easy to use and are designed to fit exactly with your vehicle's AdBlue tank filler cap. Full instructions on how to top up your AdBlue tank can be found in your car's owner's manual.

6. How do I refill the AdBlue tank?

AdBlue must only be poured into the vehicle's separate AdBlue tank and must not be put into the diesel fuel tank. AdBlue must not be mixed with any additives or diluted with water.

In order to refill the AdBlue tank, your vehicle must be parked on a level surface in order to avoid fluctuations in capacity or overfilling which can cause damage to BlueTEC exhaust gas after treatment components.

Always remember to refill your AdBlue in a well-ventilated area.

7. Can I store a bottle that has been opened to use at a later date?

No. You should use the entire AdBlue product in the bottle at the one time. Empty bottles can be recycled. Once opened and exposed to air, AdBlue bottles with leftover AdBlue fluid cannot be stored as the purity of the fluid will be compromised.