Wrong fuel in a BMW 550i? Diesel in your Petrol BMW?

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


Filling up with Diesel in a Petrol BMW is a common error. And its remedy is based on a variety of factors. In the event that you would like to find out what you have to do about this then keep reading.
Listed here are the most crucial factors to to consider whenever deciding whether to get the car drained:

  1. How much Diesel have you put in the BMW, bearing in mind that the fuel capacity of your BMW 550i is in most cases about 70 litres?
    1. Hardly any Diesel, something like 3.5 litres of Diesel in a Petrol 550i will typically not necessarily be a significant problem. Experience has demonstrated to us that an amount less than 3.5 litres (5% of the whole fuel tank volume) is generally capable of being completely diluted through entirely topping the remainder of the tank with Petrol.
      It's very rare to find a car or truck having issues with less than 5% wrong fuel contamination. Keep in mind it is very unusual - not impossible to encounter. You will discover some cars that don't stand any quantity of fuel contamination at all.
    2. Somewhere between 3.5 and 7 litres of Diesel in the BMW (5 to 10%) is really a 50/50 scenario. Our working experience demonstrates that as many people get away with this as those who break down. Any time you are deciding whether to chance it and simply fill it up consider that it is much like betting it all on black - you have got a 50/50 possibility of it being ok.
    3. Anything in excess of 7 litres of Diesel in a Petrol 550i ought to straightaway be drained seeing as your probability of succeeding with this amount of contamination is almost certainly below one in fifty - definitely big odds.
  2. Put Diesel in a Petrol BMW and drove it: Have you noted any performance issues after putting the incorrect fuel in your 550i? If that's the case, get it emptied irrespective of the amount of Diesel or the contamination percentage. Continually driving a vehicle that is beginning to suffer the consequences of fuel contamination can just lead to progressively more harm affecting the fuel system parts.
  3. Would you like peace of mind?
    In that case get it drained. Regardless of contamination ratio, there is always some extent of threat in connection with driving a Petrol motor on Petrol contaminated with Diesel. Likely results of driving on the wrong fuel can include the engine not starting, running unevenly, loss of power, degradation of the high-pressure pump, worn or bunged injectors, and the like. These are a few of the commonest Diesel in Petrol warning signs, and in the event that you notice any of them then cease driving and get it removed asap.

Steer clear of getting any untrained so-and-so to try to fix your car. We are BMW experts and have got the skills and experience necessary to ensure you are back on the road with a minimum of hassle or worry.

Put Diesel in a Petrol BMW

By mistake put Diesel in a Petrol BMW? Or perhaps even put contaminated fuel in your BMW 550i?

Give us a call for Assistance & Advice

Contact us and obtain sincere recommendations and practical assistance for your precise circumstances

We come out and do a fuel drain

We can go to you to do the complete fuel drain & purge there on scene

Once carried out You Get Going Again

As soon as we are done you should be able to get back on the road and get on with your trip

Wrong Fuel Drain Specialists

We are the top rated wrong fuel drain specialists in the UK, offering nationwide coverage, for BMW motorists especially. We typically attend to:

  • Unleaded petrol in your Diesel Vehicle
  • 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's roadside, on a petrol station forecourt, or even at your home, we are able to get you going again.

The Process

The procedure of getting rid of Diesel from a Petrol vehicle is generally identical for the majority of vehicles. As you can imagine it does differ to some extent as each make has their own distinct fuel system. Having said that it still generally 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

Diesel in Petrol Questions

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.

Get in Touch

In case you have any questions or want help please Contact Us!
We are able to get you moving 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