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What is AdBlue?
AdBlue is a mixture of water and urea, which you top up periodically, as you do with fuel. As you drive, AdBlue flows from the tank into the exhaust pipe via a dedicated catalyst. The effect is a chemical reaction that converts most of the NOx molecules into nitrogen and water. This is then released into the atmosphere as steam

As part of the overall drive to reduce emissions, and to comply with the new Euro 6 standards, more and more diesel cars now include SCR (Selective Catalytic Reduction) technology. Used in the right way, SCR can help to reduce Nitrogen Oxide (NOx) emissions by as much as 90%, with fuel efficiency also increasing by between 3% and 5%.

How do I use it?
For the technology to work, vehicles need to be fitted with a special tank for storing a liquid-reductant agent known as AdBlue®. So if your vehicle is fitted with AdBlue® there are a few things you’ll need to know.

How do I fill up the AdBlue tank?
AdBlue® is available from an increasing number of fuel stations and motorway services, but your dealer will also be able to supply AdBlue®. New vehicles tend to have a filling point next to the fuel cap, however it does vary depending on the manufacturer and model. So, it’s best to refer to the owner’s manual before you start.

How will I know when it’s needed?
It’s important to take action as soon as you see any relevant warning lights on your dashboard. There are three possible warnings:

Who pays for the AdBlue®?
Because it’s a solution you top up periodically, as you do with fuel, the costs are not covered by the maintenance contract and are therefore payable by the driver of the vehicle. The only exception to this is if the service schedule states that the fluid needs to be changed (rather than topped up).