What is AdBlue and what are the tanks at petrol stations? And do you need to fill up your diesel?

AN increasing number of petrol stations have extra tanks to forecourts – but do you know what they're for?

Sitting next to diesel and petrol, the blue pumps shouldn't be confused for another type of fuel.

What is AdBlue?

It's actually AdBlue – a urine-based solution used in diesel cars to slash emissions by converting dangerous nitrogen oxide into water vapour and nitrogen.

But many drivers are unaware they even need it in their cars because it's normally topped up as part of a regular annual service.

However, latest reports suggest high-mileage drivers are churning the solution quicker and are having to fill it up themselves.

Mercedes even came underfire for potentially switching off the tech in emissions tests to try and make tanks last longer.

all you need to know about diesel


Diesel price hits record high of over £1.50 for the first time EVER


Are electric cars exempt from London's ULEZ charges?


Foreign Office bosses buy gas-guzzling cars while urging Brits to go electric


I drive 100 miles on 1 gallon of fuel & save £40 a month – here's how you can too

Most diesels made after 2014 feature AdBlue tanks that need to be filled upCredit: Alamy

What are the AdBlue tanks at petrol stations?

AdBlue is available in a container to top it up yourself like screenwash or oil – but the easiest way is through a tank at a petrol station with an AdBlue entry point often next to your diesel filler cap.

But a survey by Servicing Stop found 70 per cent of drivers may now steer clear of AdBlue cars over fears of the inflated running costs – filling up with AdBlue is around half the price of diesel.

When your tank is running dry, you'll get a warning light on the dash – and you shouldn't ignore it.

Failing to top up between services will mean your car will limit its engine power to stop you pumping out dangerous emissions.

How does AdBlue work?

AdBlue is a colourless liquid made from urea and water and is required for cars with selective catalytic reduction (SCR) tech.

SCR is one of the latest ways to keep nitrogen oxide (NOx) emissions down within legal limits.

As diesel is burned by the engine, AdBlue is injected into the system to convert dangerous NOx into less harmful nitrogen and waper vapour.

The liquid is stored in its own tank, separate from the diesel, before being added to exhaust gases by the car. It accounts for up to six per cent of fuel consumption.

AdBlue is used on most Euro 6 diesels – mainly post 2014 – to keep NOx emissions down within EU laws.

Most tanks in cars are around 10 litres and should last for a whole year but if you do a lot of driving you'll naturally use more.

If you allow your supply of AdBlue to run out, your SCR system will not be able to function, which will lead to limited performance or your engine not running at all.

Oly Richmond, CEO and founder of Servicing Stop, said: "AdBlue is an essential that most diesel cars built after 2014 require.

"It's something that drivers of diesel will have renewed as part of their annual service but new reports suggest a whole tank is used in just a few thousand miles making AdBlue a costly accessory and toxic to the environment.

"Waiting a year for this to be renewed could be disastrous for not only the cleanliness of the air but the engine too. The thought of these tanks being introduced into petrol stations across the UK would help us keep a tight grip on emissions and reduce the price of the owners' next service."

    Source: Read Full Article