Incorrect fuel in a BMW 728i? Diesel in your Petrol BMW?

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BMW Fuel Drain


Putting Diesel in a Petrol BMW is a usual problem. And what you should do about it varies according to a variety of things. If you want to find out what you should do to sort it out then keep reading.
Listed here the key factors to be aware of whenever choosing whether to have your car drained:

  1. What amount of Diesel did you put into the BMW, bearing in mind that the fuel capacity of the BMW 728i is usually about 85 litres?
    1. A modest amount of Diesel, something like 4.25 litres of Diesel in a Petrol 728i will quite often not necessarily be a massive problem. Experience has shown us that an amount less than 4.25 litres (roughly 5% of the fuel tank capacity) is generally able to be adequately diluted by wholly filling the rest of the tank with the appropriate fuel.
      It's quite unusual to encounter a vehicle going through difficulties because of less than 5% wrong fuel contamination. Be aware that it is unusual - definitely not impossible to find. There are certain vehicles that won't stand any level of contamination at all.
    2. Between 4.25 and 8.5 litres of Diesel in the BMW (5 to 10%) is more of a 50/50 scenario. Our experience has shown that as many people get away with it as those who don't. Whenever you are deciding whether to risk it and just fill it up bear in mind that it is the same as wagering all of it on black - you have a 50/50 possibility of it working.
    3. Anything in excess of 8.5 litres of Diesel in a Petrol 728i should really right away be removed seeing that your likelihood of driving with this quantity of contamination is certainly less than one in 50 - truly big odds.
  2. Put Diesel in a Petrol BMW and drove it: Have you spotted any performance concerns as a result of putting the incorrect fuel in your 728i? If that's the case, have it removed no matter the quantity of Diesel or the contamination percentage. Continually running a car that is now beginning to suffer from the consequences of fuel contamination will definitely be responsible for even more damage affecting your fuel system components.
  3. Are you looking for reassurance?
    Then get it drained. Whatever the contamination ratio, there is always some extent of danger affiliated with running a Petrol engine on fuel contaminated with the incorrect fuel. Likely implications of driving on the wrong fuel include things like the motor refusing to start, running lumpy, losing power, degradation of the high-pressure pump, damaged or blocked injectors, and so on. These are several of the most frequently seen Diesel in Petrol signs and symptoms, and if you detect any of them then stop driving and have it removed right away.

Keep away from getting any jack-of-all-trades to try to fix your automobile. We are BMW specialists and have the certification and experience necessary to make sure that you are back on the road with no hassle or worry.

Put Diesel in a Petrol BMW

Inadvertently put Diesel in a Petrol BMW? Or perhaps even put contaminated fuel in your BMW 728i?

Give us a call for Assistance & Advice

Call us and obtain honest recommendations and practical assistance for your exact situation

We come out and drain it

We would reach you to do the fuel drain & flush there on scene

Once carried out You Get Going Again

Once we are done you will be able to get back moving and get on with your trip

Wrong Fuel Drain Specialists

We are the leading wrong fuel drain authorities in the UK, offering nationwide service, for BMW motorists especially. We predominantly attend to:

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

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

The Process

The technique of getting rid of Diesel from a Petrol vehicle is essentially similar for a large number of vehicles. Needless to say it does differ somewhat as each brand has their unique distinct fuel system. However it still basically observes the following principles:

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 questions or want help 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

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