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AdBlue (Diesel Exhuast Fluid)



A practical guide for drivers

GOVERNMENTS and the car industry are working towards increasingly stringent emissions regulations. They are put in place by the EU to protect air quality and the health of the population.

With technology such as turbocharging, manufacturers are making their engines ever more efficient, but sometimes a more radical idea is needed. The Euro 6 regulations that came in last year have forced the makers of diesel cars in particular to find new ways to reduce harmful emissions.

What is AdBlue (Diesel Exhaust Fluid (DEF))?

One of the latest techniques used to clean up diesel emissions is known as selective catalytic reduction (SCR). A solution of urea in water is used to treat exhaust gases and remove harmful pollutants, including nitrogen oxides (NOx), of which nitrogen dioxide (NO2) is the most harmful.

The fluid used in most vehicles is known as AdBlue, a registered trademark owned by the German Association of the Automobile Industry (VDA), which ensures standards are maintained. The fluid is stored in a tank in the car, but unlike petrol or diesel it is not injected into the engine; instead it is fed into part of the vehicle’s exhaust. A chemical reaction converts the harmful NOx exhaust gases into harmless nitrogen and water.

How do I know if my car uses AdBlue (DEF)?

When you buy a new or used diesel car from a dealership, the sales person should explain what features it has and specifically whether it uses AdBlue (DEF). Some cars have a blue or black screw cap for AdBlue (DEF) next to the black diesel filler cap. In others, the cap is in the boot, or in the engine compartment. The vehicle handbook will explain the requirements of your car’s system.

How will drivers know if AdBlue (DEF) needs topping up?

The car’s driver information display screen should flash up warnings, much as it would if fuel or windscreen washer fluid were low.

Failing to act on these warnings will ultimately result in the car refusing to start until the AdBlue tank is filled.

How often do you need to refill the AdBlue (DEF)?

The tank that holds the AdBlue solution varies in size between makes and models of car. As a guide, a Volkswagen Tiguan SUV and Passat family car have a 12 and 13-litre AdBlue tank respectively.

The rate it is consumed depends on the driving style; the more economical drivers are, the slower it will be used up. VW estimates that the Tiguan and Passat use 1.5 litres of AdBlue every 620 miles, and suggests that a tankful of AdBlue gives a driving range of 3,000-4,000 miles for the Tiguan, and 4,000-6,500 miles for the Passat.

AdBlue (DEF) Refill For £29.99 RRP

For mid service top-ups, we are now offering an AdBlue (DEF) refill for £29.99 RRP to manufacturers recommended fill-level, regardless of the amount required*. If you have purchased a Service Plan you can get a free refill. 

*Please contact us for availability and booking. Fee for AdBlue (DEF) check and top up to manufacturer fill level is £29.99 RRP per vehicle on a single visit.

AdBlue (DEF) Top-up bottles

You may also like to pick up an AdBlue top-up bottle from Les Pauls for peace of mind. Our sales or service teams will be happy to show you the location of your Volkswagen, Audi reservoir.

AdBlue (DEF) and your car’s warranty

If your car has a warranty, it is important to use branded AdBlue solution. For any solution to use this trademark, it must comply with certain standards that vehicle manufacturers’ SCR systems rely on. Failing to do so could invalidate the warranty.

For more information on AdBlue (DEF), or to get your AdBlue (DEF) topped up, contact us 020 8551 8537

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