How much AdBlue a vehicle uses
AdBlue consumption tracks fuel burn rather than mileage, and manufacturers generally quote it as a percentage of diesel used. The figure varies by vehicle and by how it is driven, so use your handbook rather than a single universal number.
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AdBlue consumption — the detail
It is proportional to fuel, not to distance
More fuel burnt means more NOx produced and more reagent needed to convert it. A loaded van on hills uses more than the same van empty on a motorway over the same distance.
Why tank sizes differ so much
A car tank may be small enough that the manufacturer originally expected it to be topped up at service; an HGV tank is sized to be refilled routinely alongside fuel. That difference is why the cost and logistics of a contaminated tank are not comparable between classes.
What raises consumption
Heavy loads, towing, hills, cold weather and stop-start running all raise fuel burn, and consumption follows. A sudden rise with no change in how you drive is worth investigating — it can indicate a dosing fault.
Why running it low is a bad habit
The metering pump does not benefit from running dry, and the inducement sequence starts well before empty. Topping up when the light appears rather than when the countdown starts is the whole difference between a bottle of fluid and a workshop visit.
Where to get the real figure
Your handbook states both tank capacity and expected consumption for your vehicle. Those numbers vary widely enough between manufacturers that a single figure quoted online is of no practical use.
Common questions
How often do I need to top up AdBlue?
It depends on your tank size and how hard the vehicle works. Your handbook gives the capacity and the expected consumption as a share of fuel used.
Can I top up AdBlue myself?
Yes, with sealed certified ISO 22241 fluid and a clean funnel or a bottle with its own spout. The funnel matters — a shared one that has seen fuel or oil is a contamination risk.
Is it cheaper to buy AdBlue in bulk?
Per litre usually, but bulk brings storage risk: shelf life shortens with warm storage and open containers pick up contamination.
£89 is the call-out. An AdBlue tank drain and flush is quoted on the phone before a technician travels. If the SCR system needs component replacement — dosing injector, pump, tank or catalyst — that is separate, and you will be told before any work starts. If this is a job we cannot fix at the roadside, we will tell you that on the phone rather than after we arrive.
More explainers
If something has already gone wrong
What customers say
4.8 out of 5 from 2,190 Trustpilot reviews. What reviewers mention most is that the technician stayed calm and professional with a driver who was embarrassed and stressed, and that somebody arrived when they said they would.
The most common criticism is price. People do not expect a wrong-fluid job to cost what it costs, and that is a fair complaint to publish rather than bury. The answer is the From just £89 call-out fee, a quote given on the phone before a technician travels, and being told when a job cannot be done at the roadside rather than after somebody has arrived and charged for the visit.
Who you are dealing with
Work booked through AdBlue in Fuel is carried out by Fuel Fixer Ltd, company no 08520551, registered at Fairway House, Portland Road, East Grinstead, RH19 4ET, trading as Forecourt Assist and part of Fuel Fixer International, which is owned by Stockbridge Capital Holdings.
Reference: ISO 22241 — the AdBlue standard.
Across the Fuel Fixer network
These are sister brands of the same company, not unrelated sites. Forecourt Assist keeps the canonical list at forecourtassist.co.uk/network rather than duplicating it here.