Whenever you buy from us you can be sure that you are using AdBlue® that is approved for your vehicle or equipment.

What is AdBlue®?

AdBlue® is a high purity operating fluid, used in the emissions removal systems of diesel engined vehicles and equipment. Chemically speaking AdBlue® is a 32.5% solution of Urea in purifed water.

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The AdBlue® is stored in a tank on the vehicle and from there dosed automatically by the ECU directly into the exhaust gas at a rate in relation to the amount of Nitrous Oxides (NOx) being produced by the engine.


Following mixing, the AdBlue® and exhaust gas mixture passes into a catalyst system where a chemical reaction takes place converting the NOx to harmless Nitrogen and Water, which are then expelled from the end of the exhaust.

During the reaction the AdBlue® is consumed and needs to be replaced by refilling the tank periodically. AdBlue® consumption is related to engine load, engine size, travelling terrain and temperature.

Why is AdBlue® quality so important?

A new vehicle or machine is an expensive investment so to keep it operating optimally and earning money is of vital importance.

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Because AdBlue® is dosed into a catalyst system, it is necessary to limit the presence of certain elements and compounds which can block the active sites on the catalyst.

Such blockage can reduce the efficiency of the system, ultimately causing the pollutant levels to rise outside of the preset limits in the vehicle ECU, leading to power limitation until the problem is resolved and possibly needing replacement of the catalyst.

In addition, blockage of the catalyst can lead to undesirable back pressure in the engine, leading to reduced fuel economy.

Elements that can cause problems include those found commonly in tap water such as Calcium and Magnesium which can cause a build up of scale, similar to the type found in a kettle, iron or boiler. This scale cannot be cleaned from the catalyst and is why it is important to never fill tap water into the AdBlue® tank.

Other elements needing limitation include Iron, Aluminium and Copper which block the reactive sites on the catalyst.

Whilst not normally found in high quantities in water, these elements can be introduced into the AdBlue® by the use of incompatible storage tanks, pumps or pipework as AdBlue® is mildly alkaline and will dissolve metals such as mild steel, aluminium alloys and brass.

These dissolved metals will then be irreversibly deposited in the catalyst.

Know what you are buying

You can check that your supplier is offering you genuine AdBlue® by visiting the VDA website and finding the manufacturer on the list of approved companies.

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Together, the vehicle and chemical manufacturers have developed a quality standard (DIN 70070 ISO22241) to define the solution to be used in diesel SCR systems.

To make it easy for you as a consumer to recognise solution of the correct quality, the trademark AdBlue® has been registered by the VDA and only producers committed to supplying to the ISO standard have been licensed by the VDA to use the AdBlue® trademark.

So whenever you buy Fleetblue® you can be sure that you are using AdBlue® that is approved for your vehicle or equipment.

What if the product does not have the AdBlue® Trademark?

Suppliers offering unbranded AdBlue® are unlikely to have used the correct high purity raw materials and even less likely to have performed the full quality analysis needed to ensure the fluid will not harm the system.

The solution may even have been diluted, meaning your vehicle will consume more than usual.

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Often these products are manufactured from fertilizer grade Urea which contains chemicals to assist with application by farm machinery, but which if used in a diesel SCR system cause expensive and irreversible damage to the catalyst.

If in doubt you should always ask for a detailed test certificate that shows the fluid has been analysed to ISO22241 and check that the manufacturer is registered with the VDA.

Remember, the AdBlue® trademark is your guarantee that what you are putting in your vehicle’s tank will not cause damage to the exhaust system.

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