AdBlue®: Selective Catalytic Reduction

Advanced emissions control for diesel engines.

Many of our diesel cars are fitted with an advanced emissions control system which helps the vehicle comply with the latest Euro 6 exhaust gas regulations. The addition of AdBlue® allows for far-improved MPG returns, so this cost is more than off-set by the reduced costs in diesel.

How does it work?

AdBlue®, a water/urea based additive for diesel engines, is stored in a tank and injected directly into a specially modified part of the vehicle’s exhaust. This, in turn, begins a chemical reaction in order to remove the polluting oxides of nitrogen, converting them into harmless oxygen and nitrogen in a process called ‘Selective Catalytic Reduction (SCR)’. SCR is only available for diesel engines and you will use less AdBlue® the more economically you drive.

Depending on the model and size of the vehicle you have, the size of the AdBlue® tank fitted and the rate at which AdBlue® is consumed will vary. Many other factors will also affect how much AdBlue® is used (and, by extension, how often top-ups will be required), these include: mileage, driving style, journey type, and environmental conditions.

Generally, a passenger car can consume approximately 1.5 litres of AdBlue® every 620 miles, but please refer to your operator’s manual, or speak to a member of our staff for more in-depth information.

How will I know when to top AdBlue® up?

When your vehicle is due a top up, a series of warnings will be given via the driver information system. These warnings, and their frequency, will differ depending on your vehicle’s make and model, so please refer to your manual if you have any concerns.

However, if these warnings are ignored and the AdBlue® is allowed to deplete, the vehicle will no longer restart once the ignition is turned off; this is a required feature of the system, not a fault. If this happens the vehicle will require a full AdBlue® top-up and a repairer will be required to re-programme the vehicle before it can be restarted. If in doubt, please contact a member of our staff who are happy to help.

TCH Leasing will pay for AdBlue® top-ups that are within your scheduled service visits; however, it will be the driver’s responsibility to arrange the top-up outside of these scheduled service visits. AdBlue® can be purchased from most good fuel stations.

Other Important Information

  • AdBlue® is not a fuel additive. This is why it requires a separate tank
  • If you put AdBlue® in your fuel tank by mistake, do not start the engine. Instead, contact us immediately for help
  • Put only AdBlue® in the AdBlue® tank; do not fill the tank with any other liquids
  • Prevent anything from contaminating AdBlue®
  • If small quantities of AdBlue® come into contact with your skin or the vehicle’s paintwork, wipe it off immediately and rinse the area thoroughly with water

More Information

For more information about AdBlue® or the SCR system please contact us on 0333 0146 059 and one of our members of staff will be happy to assist you.


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Should you need to contact us,
you'll find us at:

  • 9 Brookdale Court, Chapeltown, Sheffield, South Yorkshire S35 2PT
  • 0333 0146 059
  • Emergency Assist     0333 240 7158     
  • info@tchleasing.co.uk