Bad fuel in your BMW M5? Diesel in your Petrol BMW?

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


Filling Diesel in a Petrol BMW is a regular error. And its remedy is dependent upon a few factors. If you would like to find out what to do to fix it then please read on.
Listed below are the key variables to keep in mind whenever determining whether or not to get a fuel drain:

  1. How much Diesel did you put in to the BMW, taking into account that the fuel tank capacity of your BMW M5 is in most cases about 70 litres?
    1. A small amount of Diesel, as little as 3.5 litres of Diesel in a Petrol M5 will more often than not not be a significant problem. Experience has demonstrated to us that quantities less than 3.5 litres (approximately 5% of the entire fuel tank volume) is generally capable of being completely diluted simply by thoroughly filling the tank with the appropriate fuel.
      It's highly rare to encounter a car or truck having problems with less than 5% incorrect fuel contamination. Keep in mind that it is infrequently found - definitely not impossible to encounter. There are actually some vehicles that won't stand any degree of fuel contamination whatsoever.
    2. In between 3.5 and 7 litres of Diesel in the BMW (5 to 10%) is a 50/50 scenario. Our expertise has demonstrated that as many motorists get away with it as those who break down. Whenever you are figuring out whether to risk it and just top it up consider that it is the same as betting all of it on black - you will have a 50/50 possibility of it working out.
    3. Anything more than 7 litres of Diesel in a Petrol M5 should really straightaway be removed since your likelihood of getting away with that amount of contamination is more than likely lower than one in 50 - extremely long odds.
  2. Put Diesel in a Petrol BMW and drove it: Have you noted any performance problems ever since putting the bad fuel in your M5? If that's the case, get it emptied no matter the amount of Diesel or even the contamination percentage. Proceeding to drive running a motor vehicle that is now starting to suffer the consequences of fuel contamination can typically cause even more harm being caused to your fuel system components.
  3. Do you want security?
    Simply get it removed. Regardless of contamination percentage, there is invariably some degree of threat caused by driving a Petrol vehicle on Petrol contaminated with the incorrect fuel. Possible implications of driving on the incorrect fuel normally include the motor refusing to start, running lumpy, decrease in power, wearing of the high-pressure pump, damaged or blocked injectors, and so on. These are some of the most typical Diesel in Petrol warning signs, and in the event that you observe any of them then stop and have it removed as soon as possible.

Refrain from having any unqualified mechanic to attend your automobile. We are BMW specialists and have the qualifications and practical experience needed to make certain you get back on the road with minimal hassle or worry.

Put Diesel in a Petrol BMW

Inadvertently put Diesel in a Petrol BMW? Or possibly even put contaminated fuel in your BMW M5?

Give us a call for Assistance & Advice

Give us a call and obtain sincere guidance and sensible assistance for your specific situation

We come out and drain it

We can reach you to undertake the fuel retrieval & clean right there on scene

Once done You Get Going Once again

As soon as we have completed you can get back on the road and get on with your trip

Wrong Fuel Drain Specialists

We are the leading wrong fuel drain authorities in the UK, having countrywide cover, for BMW motorists particularly. We primarily attend:

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

We are BMW specialists and have successfully drained hundreds of Petrol BMW vehicles. Whether it is roadside, on a filling station forecourt, or even at your house, we can get you on the road again.

The Process

The method of getting rid of Diesel from a Petrol car is essentially similar for most vehicle makes. Naturally it can vary a little as each brand has their particular different fuel system. Even so it still generally follows the below points:

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.

Call us

Should you have any questions or need some help please Contact Us!
We can get you on the road 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