What is AdBlue?

AdBlue is simply a brand name for Diesel Exhaust Fluid (DEF) and is not a fuel additive but a non-toxic exhaust fluid made up of  de-ionised water and urea. Contrary to popular belief, urea is not made from pig urine (although urea is a chemical found in pigs’ urine)

Most diesel cars built after 2015 (Euro6 Diesels) are equipped with a Selective Catalytic Reduction (SCR) system and use AdBlue.

AdBlue Cap

How Does AdBlue Work?

Small amounts of AdBlue is injected into your car’s exhaust system, transforming the AdBlue into ammonia and carbon dioxide at a very high temperature.

Once inside the SCR (Selective Catalytic Reduction) catalyst, the harmful nitrogen oxide (NOX) in your exhaust reacts with the ammonia and is converted into harmless nitrogen and water that comes out of the exhaust pipe and disperses into the atmosphere.

What happens if your car runs out of AdBlue?

A warning will appear on your dashboard to advise you that your AdBlue fluid is running low. An amber warning light will then follow when the tank is almost empty.

If your AdBlue runs out while you are driving, your engine will go into ‘Limp Mode’ and your engine’s performance and power will be reduced in order to limit the emissions produced.

Once you turn off your engine or your engine stops, your engine will not start until you refill the AdBlue tank.

AdBlue Storage

Do not store your Adblue in direct sunlight. AdBlue should be stored between 0 and 30°C, and should be properly sealed when it’s not being used. AdBlue can freeze at -11°C, however, once thawed it will return to its original liquid state.

If you have any AdBlue issues and need further, expert advice, contact us on Luton 01582 968995.