Incorrect fuel in a BMW M550d xDrive? Petrol in your Diesel BMW?

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


Putting Petrol in a Diesel BMW is a fairly typical problem. And exactly what you need to do about it is based on a number of things. Assuming you would like to know what it is advisable to do to sort it out then keep on reading.
Here are the key variables to be aware of when deciding whether to get a fuel drain:

  1. How much Petrol did you put into the BMW, bearing in mind that the fuel tank capacity of the BMW M550d xDrive is usually about 70 litres?
    1. A tiny amount of Petrol, something like 3.5 litres of Petrol in a Diesel M550d xDrive will in most cases not be a significant problem. Experience has taught us that anything less than 3.5 litres (which is 5% of the total fuel tank) is quite often able to be sufficiently diluted by means of entirely topping the remainder of the tank with Diesel.
      It's relatively uncommon to come across a car or truck going through difficulties with less than 5% wrong fuel contamination. Bear in mind that it is rare - not impossible to encounter. There are actually a few motor vehicles that won't endure any level of contamination in the slightest.
    2. In between 3.5 and 7 litres of Petrol in the BMW (5 to 10%) is more of a 50/50 situation. Our experience has revealed that as many motorists get away with this as those people who don't. When deciding on whether to risk it and simply top it up remember that it is very much like wagering your car on black - you will have a 50/50 possibility of it working.
    3. Anything more than 7 litres of Petrol in your Diesel M550d xDrive must as soon as possible be drained because your likelihood of getting away with this level of contamination is very likely less than one in 50 - definitely big odds.
  2. Put Petrol in a Diesel BMW and drove it: Have you seen any performance troubles ever since putting the bad fuel in the M550d xDrive? If so, have it removed irrespective of the volume of Petrol or the contamination percentage. Still driving a car that is already starting to suffer the effects of wrong fuel contamination will probably only lead to more and more harm being caused to your fuel system.
  3. Do you need assurance?
    In that case get it emptied. Regardless of the contamination percentage, there is inevitably some extent of danger associated with driving a Diesel vehicle on fuel contaminated with Petrol. Probable outcomes of driving a vehicle on the incorrect fuel can include the motor refusing to start, running unevenly, decrease in power, degradation of the high-pressure pump, damaged or blocked injectors, and the like. These are some of the most common Petrol in Diesel warning signs, and should you observe any of them then stop driving and get it removed right now.

Do not simply have any unqualified mechanic to try to repair your automobile. We are BMW experts and have got the credentials and experience needed to make sure that you are back on the road with a minimum of hassle or worry.

Put Petrol in a Diesel BMW

Mistakenly put Petrol in a Diesel BMW? Or perhaps even put contaminated fuel in your BMW M550d xDrive?

Call us for Assistance & Recommendations

Give us a call and receive straightforward recommendations and practical help for your exact circumstance

We come out and drain it

We can reach you to do the full contaminated fuel removal & clean right there on scene

Once done You Get Moving Once again

Once we are done you can get back on the road and get on with your trip

Wrong Fuel Drain Specialists

We are the leading wrong fuel drain experts in the UK, offering nationwide service, for BMW motorists in particular. We mostly attend:

  • Unleaded petrol in Diesel Vehicle
  • Diesel in Unleaded Petrol Car
  • AdBlue contamination
  • Water contamination

We are BMW specialists and have successfully drained hundreds of Diesel BMW vehicles. Regardless of whether it is at the roadside, on a station forecourt, or even at home, we are able to get you going again.

The Procedure

The system of draining Petrol from a Diesel vehicle is fundamentally identical for the majority of vehicles. Of course it does vary somewhat as each make has their own different fuel system. Having said that it still fundamentally adheres to the following 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

Petrol in Diesel Questions

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

I put Petrol in a Diesel 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 Diesel car on Petrol 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 Petrol can I get away with in a Diesel 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 Diesel 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 questions or want our help please Contact Us!
We are able to get you moving once again.

24/7 BMW Helpline

0333 366 0103

Our Business Office

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

Weekdays: 9am to 5pm

Important Info

Fully Insured

VAT Registered

APEX Certified


Fully Mobile

Professionally Trained