Bad fuel in a BMW 750i xDrive? Diesel in a Petrol BMW?

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BMW Fuel Drain


Filling up with Diesel in a Petrol BMW is a usual problem. And its remedy varies according to various factors. In the event that you want to find out what it is advisable to do to fix it then please read on.
Here are the most important factors to keep in mind whenever figuring out whether or not to have a fuel drain:

  1. Exactly how much Diesel have you put in to the BMW, bearing in mind that the fuel capacity of your BMW 750i xDrive is normally approximately 82 litres?
    1. A small quantity of Diesel, something like 4.1 litres of Diesel in a Petrol 750i xDrive will in most situations not really be a massive problem. Experience has shown us that anything less than 4.1 litres (which is 5% of the entire fuel tank capacity) is oftentimes able to be sufficiently diluted by means of entirely topping the rest of the tank with Petrol.
      It's highly rare to come across a vehicle going through difficulties due to lower than 5% wrong fuel contamination. Please remember it is infrequently found - certainly not impossible to encounter. You will discover a few motor vehicles that won't stand any level of contamination in the slightest.
    2. Anywhere between 4.1 and 8.2 litres of Diesel in the BMW (5 to 10%) is really a 50/50 scenario. Our working experience demonstrates that as many motorists get away with this as all those who break down. Whenever trying to decide whether to risk it and simply fill it up bear in mind that it is much like gambling your car on black - you have got a 50/50 chance of it working out.
    3. Anything in excess of 8.2 litres of Diesel in a Petrol 750i xDrive must straight away be drained out since your likelihood of succeeding with that amount of contamination is probably less than one in fifty - really big odds.
  2. Put some Diesel in a Petrol BMW and drove it: Have you detected any performance difficulties as a result of putting the wrong fuel in your 750i xDrive? In that case, get it drained regardless of the amount of Diesel or even the contamination percentage. Continuing to drive driving a vehicle that is now starting to suffer from the consequences of wrong fuel contamination will typically result in increasing amounts of damage affecting your fuel system components.
  3. Do you need peace of mind?
    Then get it drained. Regardless of contamination percentage, there is always some degree of danger caused by operating a Petrol motor on fuel contaminated with Diesel. Likely implications of driving a vehicle on the wrong fuel include the engine refusing to start, running lumpy, lack of power, degradation of the high-pressure pump, damaged or blocked injectors, etc. These are a few of the most common Diesel in Petrol signs or symptoms, and if you observe any of them stop and have it removed right away.

Avoid getting any unqualified mechanic to try to fix your car. We are BMW experts and have the credentials and expertise necessary to ensure that you are back on the road with a minimum of hassle or trouble.

Put Diesel in a Petrol BMW

Accidentally put Diesel in a Petrol BMW? Or possibly even put contaminated fuel in your BMW 750i xDrive?

Contact us for Help & Guidance

Contact us and receive genuine recommendations and practical assistance for your exact circumstances

We arrive and drain it

We are able to come to you to do the complete contaminated fuel retrieval & clean there on scene

Once carried out You Get Moving Once again

Once we have finished you should be able to get back on your way and get on with your day

Wrong Fuel Drain Specialists

We are the primary wrong fuel drain authorities in the UK, having national cover, for BMW motorists particularly. We predominantly fix:

  • Unleaded petrol in your Diesel Vehicle
  • Diesel in your Unleaded Petrol Vehicle
  • AdBlue fuel contamination
  • Water fuel contamination

We are BMW specialists and have successfully drained thousands of Petrol BMW vehicles. Even if it's roadside, on a filling station forecourt, or even at your house, we are able to get you going once again.

The Process

The technique of extracting Diesel from a Petrol car is generally similar for the majority of motor vehicles. Needless to say it does vary slightly as each make has their own different fuel system. However it still basically follows the following points:

Petrol in Diesel BMW

Fuel Drain

Empty the Fuel Tank

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Wrong Fuel Drain BMW

System Flush

Clean out the fuel lines & pumps

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Petrol in Diesel Drain BMW

Vehicle Restart

Get the car up and running again

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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.

Contact Us

In the event that you have any queries or need our assistance please Call us!
We can get you on the road 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

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