What is AdBlue?

What is AdBlue?

What it is

AdBlue is a diesel exhaust fluid which is used to make diesel vehicles less polluting.  It is a solution made with urea and deionised water.

How it works

Once exhaust gas passes through the DPF (diesel particulate filter) AdBlue is sprayed, mixes with the exhaust gas, neutralises it to form harmless nitrogen and water vapour.

How do you know if your vehicle uses AdBlue and how do you top it up?

Firstly, only diesel vehicles use AdBlue. 

If you have a diesel Jaguar, Land Rover or any French or German manufacturer which was registered after September 2015 it will more than likely use AdBlue. 

If in doubt check the vehicle handbook which will tell you.

To top up AdBlue you will need to locate the filler cap which is usually next to the diesel filler cap.  If not, check the boot and under the bonnet.  The cap will be blue and will look something like this.

What you need to know

  • If you get an AdBlue message or light on your dashboard, take it seriously, if the AdBlue tank runs dry or if the sensor is faulty your vehicle will go into limp mode and will not restart once stopped.
  • If your vehicle is running low on AdBlue, top it up as soon as possible.
  • Never run the AdBlue tank dry.
  • Never put water in the AdBlue tank


If you have any questions or concerns regarding AdBlue in your vehicle or if there are any messages on your dashboard regarding AdBlue, please get in touch.

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