Oil in the AdBlue tank
Oil in the AdBlue tank is hydrocarbon contamination of a precision dosing circuit and it is a component-risk job, not a drain. Oil films every internal surface and will not rinse out with water. Do not run the engine. Call 01293 248666.
Oil behaves worse in this circuit than diesel does. It is more viscous, it clings, and it does not flush with demineralised water at all — the two do not mix and water simply runs past the oil film. Every internal surface of the tank, the in-tank strainer, the metering pump and the heated delivery lines holds a coating that will keep releasing into fresh fluid long after the bulk oil is gone.
Call 01293 248666 From just £89 call-out fee
Oil in the AdBlue tank — the severity verdict
| Severity | Component risk Frequently needs SCR component work rather than a drain. Quoted before a technician travels. |
|---|---|
| What went where | Oil in the AdBlue tank |
| Direction | Into the AdBlue tank |
| Typical cost | £300–£900 typical total, from a £89 call-out |
| Time on site | About 110 minutes |
| Call-out | From just £89 call-out fee |
| Helpline | 01293 248666, 24 hours |
£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.
What to do right now
- Do not start the engine.
- Do not add AdBlue on top.
- Note which oil it was — engine, gear, hydraulic — because the flush differs.
- Call 01293 248666.
What a technician actually does
Drain and separate capture, repeat flushing, strainer and pump assessment, and a frank conversation about whether the tank and lines are worth flushing further or worth replacing. Replacement is quoted before it happens.
Why this is not the same job as the other direction
This is contamination of the SCR dosing circuit — tank, metering pump, heated lines, dosing injector and potentially the catalyst. It is not the fuel system, and it is not the cheaper job. Anyone quoting a flat drain price for this has not looked at the system.
Common questions
Why is oil worse than diesel here?
Viscosity and clinging. Diesel at least thins and carries with a flush; oil films the surfaces and keeps releasing into fresh fluid afterwards.
Can the tank be saved?
Sometimes, with repeat flushing. Sometimes replacement is cheaper than the labour of chasing it. You get told which, with the numbers, before anything is ordered.
Is this a roadside job?
The drain usually is. The rest usually is not, and we will say so on the phone rather than after arriving.
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.
Related AdBlue problems
Start from a symptom instead
Where we cover
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: Urea (Wikipedia).
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.