AdBlue – Everything You Need To Know

19 October 2021 Blog

AdBlue is a diesel exhaust fluid that helps reduce harmful emissions.

You may have noticed newer diesel vehicles require the addition of Adblue. We share everything you need to know about Adblue… and bust some myths whilst we are at it!


What Is AdBlue & Why Do I Need To Use It?

The aim of AdBlue is to reduce harmful emissions.

AdBlue is a diesel exhaust fluid that mixes with the fumes that your car produces to reduce the amount of air pollution your diesel engine produces. Before the fumes leave your exhaust, they are cleaned to reduce the nitrogen in turn making your diesel vehicle far more environmentally friendly.

When Euro 6 standards were introduced, they demanded Nitrogen Oxides (NOx) needed to be reduced by at least 67% in a bid to help clean up the environment.


Which Cars Need AdBlue?

The majority of diesel cars registered after September 2015 require AdBlue. If you own a Euro 6 compliant vehicle, it is highly likely that you will need to use AdBlue.

If you are unsure whether your car needs AdBlue, the model name will usually contain the word ‘Blue’. The handbook should also state whether it is AdBlue.

The other big clue is checking next to the fuel tank to see if there is an AdBlue tank.


How Do I Fill Up With AdBlue & How Often?

The most common place to fill up with AdBlue is found right next to your diesel fuel cap. It will usually have a blue lid, which makes it easy to distinguish from your normal diesel cap. If you cannot find it there, then there is a good chance it will be in your boot/spare wheel well.

How often you fill your car with AdBlue can depend on your driving style, the size of your tank and the number of miles you cover. There will be a warning light that appears on your dashboard to let you know when you are running low and its time to top up. Once you have topped your vehicle back up, this will trigger the sensor to let the car know it is at an adequate level and the light will disappear from your dashboard.


Can I Water Down AdBlue To Save Money?

It is important that you never add water to your AdBlue.

AdBlue is actually a mixture of urea and 67.5% de-ionized water and is made this way specifically for diesel vehicles.

Misfuelling diesel and petrol vehicles is quite a common mistake to make at fuel stations, so you can’t ever rule out inserting AdBlue into your diesel fuel tank if you are ever in a rush or not fully concentrating. If this does happen, you must not start your engine and contact a breakdown/recovery agent immediately. They will need to flush out the system to make sure no damage is done to any of the vehicle’s components.


Where Can I Buy AdBlue From?

AdBlue will usually be checked and topped up as part of your vehicle’s service. However, if you do need to top it up yourself in between, it can be purchased at most fuel stations so you can pick some up the next time you are filling up with diesel.

Failing that, online retailers, garages and even some supermarkets will stock it.

They come in a variety of different sizes so you could even purchase a smaller 1.5L container to keep in your car in case of an emergency.