What you need to know before buying AdBlue
AdBlue is a registered trademark for a specific fluid: a 32.5% solution of high-purity urea dissolved in demineralised water. The composition is defined by ISO 22241, and that standard matters. Off-spec fluid, diluted fluid, or fluid stored in a contaminated container can damage SCR components, particularly the injector and the catalyst. It is not worth saving a few pounds on fluid to risk a pump or catalyst replacement.
All AdBlue sold by Truckstop Group is ISO 22241 compliant. Products listed include 10-litre containers from BlueBox and Greenox with integrated pouring spouts, and larger volumes for workshop or fleet use. The BlueBox 10L uses reduced-plastic packaging, which makes disposal straightforward. The Greenox 10L comes with a spout behind the label.
A few practical points on storage and handling. AdBlue freezes at around -11 degrees Celsius, so it should be stored in a frost-free environment during winter. It is not flammable, but it is corrosive to certain metals, including copper, zinc, and aluminium. Never store it in a diesel container. The fluid has a shelf life of approximately 12 months in an unopened container at temperatures below 25 degrees. Once opened, use it promptly.
Consumption varies by vehicle and duty cycle, but most HGVs use around 3-6% of their diesel consumption in AdBlue. A truck doing high mileage on motorway routes will get through significantly more than one doing local distribution work. Most vehicles show a dashboard warning when the tank drops to around 10% capacity.
If you're dealing with an SCR fault rather than just a fluid top-up, see our AdBlue Systems collection for pump, injector, and tank parts. Need to check which size container works for your vehicle? Call us on 01527 598 000.
Frequently Asked Questions
Is all AdBlue the same?
Chemically, genuine AdBlue must meet ISO 22241, which defines the composition as 32.5% high-purity urea in demineralised water. Any product meeting that standard is interchangeable. Brand differences are primarily packaging and price. What you should avoid is off-spec or diluted fluid, which can crystallise inside injectors or degrade SCR catalysts. Always buy from a supplier you trust and check the ISO 22241 mark.
What size AdBlue do I need for my HGV?
Most HGV AdBlue tanks hold between 40 and 75 litres, depending on the make and model. For a top-up, a 10-litre or 20-litre container is typically enough. Workshops and fleets running multiple vehicles are better served by drum or IBC quantities. Check your vehicle handbook for the tank capacity and consumption rate if you're unsure.
Can AdBlue freeze in winter?
Yes. AdBlue freezes at approximately -11 degrees Celsius. Most modern HGVs with SCR systems have a built-in tank heater to thaw the fluid before start-up in cold conditions, so winter operation is normal. For storage, keep containers in a frost-free environment. Frozen AdBlue returns to its correct concentration once thawed and is still usable, provided the container was sealed.
How long does AdBlue last in storage?
In an unopened container stored below 25 degrees Celsius and away from direct sunlight, AdBlue typically has a shelf life of around 12 months. Storage at higher temperatures degrades the fluid faster. Once a container is opened, use it within a reasonable period and reseal it between uses. Do not transfer AdBlue into a container previously used for diesel or other fluids.
Can I put AdBlue in the diesel tank by mistake?
It happens, and it is a serious problem. AdBlue is corrosive to fuel system components and will damage injectors, pumps, and the fuel tank if mixed with diesel. If you've put AdBlue in the diesel tank, do not start the engine. The tank and fuel system will need to be drained and flushed by a mechanic. The two filler caps are usually different sizes on modern vehicles to prevent this, but the mistake still occurs.
Do you sell AdBlue near me?
AdBlue is available for collection from our branches in Redditch, Worcester, Birmingham, and Evesham. In-stock items can be collected within two hours; call the branch directly before travelling. Same day delivery is available to Worcestershire, Warwickshire, Herefordshire, and Gloucestershire for orders placed before 11am.
