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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.

What is AdBlue®?

AdBlue® is a fluid that is sprayed into a diesel vehicle’s exhaust system to reduce the nitrous oxide emissions of diesel engines. AdBlue® is created by mixing urea and deionised water. The use of AdBlue® has increased in recent years since the introduction of stricter emissions standards in 2016.

How Does AdBlue® Work?

AdBlue® is stored in a separate tank to the fuel and works by injecting directly into a specially modified part of the vehicle’s exhaust. This then starts a chemical reaction that converts the polluting oxides of nitrogen into harmless oxygen and nitrogen; a process known as Selective Catalytic Reduction (SCR) which now allows for many diesel cars to be under the regulated emissions and be road legal.

How Often do I Need to Top Up my AdBlue®?

Your AdBlue® will be topped up during your regular servicing, however it may be that you will need to replenish the AdBlue® in your diesel vehicle in between services. It can be purchased from most fuel stations and some supermarkets. Cars that need AdBlue® in order to work will have a gauge on the dashboard to monitor the levels in the tank and will often display warnings when more is needed.


TCH Leasing will pay for the 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 servicing.

What Happens if my Car Runs Out of AdBlue®?

If your car’s AdBlue® runs out, you will notice a reduction in power and performance which will lead to the car simply not starting as the tank is dry. The AdBlue® will need to be replaced before the car’s engine will be able to start again.


It is important that the levels of AdBlue® are monitored correctly as, according to the AA, 23,000+ breakdowns have been linked to the misuse of AdBlue® in diesel cars.


For more information about AdBlue® or the SCR system please contact us on 0333 240 7158 and one of our members of staff will be happy to assist you.

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