Contaminated fuel in your BMW x5? Diesel in your Petrol BMW?

We can help!
Call us: 0333 366 0103
BMW Fuel Drain


Putting Diesel in a Petrol BMW is a well-known mistake. And its solution is dependent upon a variety of things. In case you would like to know what it is advisable to do about this then please read on.
These are the key variables to keep in mind when making a decision whether or not to have it drained:

  1. Exactly how much Diesel have you put in to the BMW, keeping in mind that the fuel tank capacity of the BMW x5 is normally about 92 litres?
    1. A small quantity of Diesel, as little as 4.6 litres of Diesel in a Petrol x5 will quite often not necessarily be a huge problem. Experience has shown us that anything under 4.6 litres (5% of the fuel tank) is usually able to be adequately diluted simply by thoroughly topping up the tank with Petrol.
      It is extremely unusual to encounter a motor vehicle having issues due to under 5% incorrect fuel contamination. Bear in mind that it is very rare - certainly not impossible to encounter. You will discover a few vehicles that don't endure any amount of contamination whatsoever.
    2. Somewhere between 4.6 and 9.2 litres of Diesel in the BMW (5 to 10%) is really a 50/50 situation. Our practical experience has revealed that as many motorists get away with this as those people who don't. Any time you are trying to decide whether or not to risk it and just top it up remember that it is the same thing as betting everything on black - you've got a 50/50 possibility of it working out.
    3. Anything above 9.2 litres of Diesel in a Petrol x5 should straight away be drained since your probability of getting away with that level of contamination is undoubtedly less than one in 50 - really huge odds.
  2. Put some Diesel in a Petrol BMW and drove it: Have you noted any kind of performance problems since putting the wrong fuel in your x5? If so, get it emptied irrespective of the amount of Diesel or even the contamination ratio. Continually driving a motor vehicle that is now starting to suffer the consequences of fuel contamination can typically be responsible for even more damage being done to the fuel system parts.
  3. Are you interested in security?
    You should get it removed. Regardless of the contamination percentage, there is invariably a certain level of threat affiliated with running a Petrol engine on fuel contaminated with the wrong fuel. Possible implications of driving a vehicle on the wrong fuel normally include the motor not starting, running lumpy, lack of power, degradation of the high-pressure pump, worn out or clogged injectors, and so on. These are some of the most frequently seen Diesel in Petrol signs or symptoms, and if you recognise any of them then stop and have it drained immediately.

Do not just get any jack-of-all-trades to try to fix your vehicle. We are BMW specialists and hold the skills and experience necessary to make certain you are back on the road with little hassle or trouble.

Put Diesel in a Petrol BMW

Mistakenly put Diesel in a Petrol BMW? Or possibly even put contaminated fuel in your BMW x5?

Call us for Help & Recommendations

Contact us and obtain honest advice and practical assistance for your exact circumstance

We come out and drain it

We can go to you to perform the complete contaminated fuel drain & cleanse right there on scene

All done & You Get Going Once again

When we have finished you are able to get back on your way and get on with your day

Wrong Fuel Drain Specialists

We are the primary wrong fuel drain professionals in the UK, boasting nationwide cover, for BMW motorists especially. We primarily attend to:

  • Unleaded petrol in a Diesel Auto
  • Diesel in Unleaded Petrol Auto
  • AdBlue fuel contamination
  • Water contamination

We are BMW specialists and have successfully drained thousands of Petrol BMW vehicles. No matter if it's roadside, on a petrol station forecourt, or even at home, we can get you moving once again.

The Procedure

The technique of removing Diesel from a Petrol car is generally identical for virtually all cars. Naturally it can vary a little as every make has their own different fuel system. Nevertheless it still basically observes the below principles:

Petrol in Diesel BMW

Fuel Drain

Empty the Fuel Tank

View more
Wrong Fuel Drain BMW

System Flush

Clean out the fuel lines & pumps

View more
Petrol in Diesel Drain BMW

Vehicle Restart

Get the car up and running again

View more


Hours a Day


Days a Week





Our Partners

Just some of the few people we work with to bring you the best petrol in diesel service possible

Diesel in Petrol FAQs

When someone has put Diesel in a Petrol car they have a few very common questions. So we have compiled a list of the most Frequently Asked Questions for you

I put Diesel in a Petrol car and drove it. What do I do?


Turn off the car as soon as possible and call us. Continuing to run a vehicle on the wrong fuel can potentially damage it. We will be able to give you advice and assistance based on your circumstances

Will driving a Petrol car on Diesel cause damage to it?


It can. However, if the problem is caught and remedied quickly the risks will be minimal. Of the 1,500 vehicles we attend every month, less than 0.5% have suffered and substantial damage requiring parts replacement.

How much Diesel can I get away with in a Petrol car?


The safe answer is none. However you might be able to get away with a very low contamination ratio. That being said, we always highly recommend draining anything over a 5% contamination ratio asap.

I know about petrol in diesel, but what about Super Unleaded?


Putting Super Unleaded, or Shell V-Power, BP Ultimate Unleaded, etc, will have the exact same effect as putting regular unleaded petrol in your diesel car and will need to be drained out and flushed.

Will getting you to do a fuel drain void my warranty?


No! The EU Block Exemption Regulations clearly state that "the work can be carried out by as long as that garage uses manufacturer approved parts and correctly follows the manufacturer's service schedule."

Can I top it up with Petrol and add some 2-stroke oil?


This might work on some vehicles in some cases, but in the majority on instances it won't and you risk damaging the Lambda sensors as well as fuel pump and injectors, just as a regular misfuel.

Contact Us

Should you have any queries or need assistance please Call us!
We are able to get you moving once again.

24/7 BMW Helpline

0333 366 0103

Our Corporate Office

Fuel Fixer Ltd, Linx House, 147 London Road, East Grinstead, RH19 1ET

Important Info

Fully Insured

VAT Registered

APEX Certified


Fully Mobile

Professionally Trained