Bad fuel in a BMW 540i? Diesel in a Petrol BMW?

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BMW Fuel Drain


Filling up with Diesel in a Petrol BMW is a well-known mistake to make. And its remedy hinges on a few things. In the event that you would like to know what to do to fix it then read on.
Listed below are the main variables to take into consideration whenever choosing whether or not to get the car drained:

  1. Exactly how much Diesel have you put in the BMW, considering that the fuel capacity of the BMW 540i is usually roughly 70 litres?
    1. A modest amount of Diesel, as little as 3.5 litres of Diesel in a Petrol 540i will in most situations not necessarily be a massive problem. Experience has shown us that quantities under 3.5 litres (which is about 5% of the total fuel tank capacity) is oftentimes able to be completely diluted by completely topping the rest of the tank with Petrol.
      It's extremely uncommon to encounter a vehicle going through issues with under 5% wrong fuel contamination. Bear in mind that it's infrequently found - certainly not impossible to find. You can get a number of automobiles that will not endure any amount of contamination whatsoever.
    2. Anywhere between 3.5 and 7 litres of Diesel in the BMW (from 5 to 10%) is really a 50/50 situation. Our working experience has proven that as many drivers get away with it as those who don't. When trying to decide whether to risk it and just fill it up remember that it is much like wagering everything on black - you have got a 50/50 possibility of it working out.
    3. Anything in excess of 7 litres of Diesel in a Petrol 540i should really as soon as possible be drained because your likelihood of driving with this level of contamination is undoubtedly less than one in 50 - extremely long odds.
  2. Put Diesel in a Petrol BMW and drove it: Have you detected any kind of performance difficulties ever since putting the bad fuel in your 540i? If so, have it emptied irrespective of the volume of Diesel or the contamination percentage. Proceeding to run driving a vehicle that is currently starting to suffer the consequences of fuel contamination will only bring about more harm being done to your fuel system.
  3. Do you want assurance?
    You should get it drained. Regardless of contamination percentage, there is always a certain level of danger resulting from running a Petrol motor on fuel contaminated with Diesel. Probable outcomes of driving on the incorrect fuel include the engine refusing to start, running lumpy, loss in power, wearing of the high-pressure pump, damaged or bunged injectors, etc. These are a few of the most typical Diesel in Petrol signs and symptoms, and in the event that you observe any of them cease driving and have it drained as soon as possible.

Stay away from having any jack-of-all-trades to try to fix your automobile. We are BMW experts and possess the qualifications and working experience necessary to ensure that you get back on the road with little hassle or trouble.

Put Diesel in a Petrol BMW

Unintentionally put Diesel in a Petrol BMW? Or possibly even put contaminated fuel in your BMW 540i?

Contact us for Assistance & Guidance

Call us and get reliable advice and sensible assistance for your exact circumstances

We show up and drain it

We would go to you to do the complete contaminated fuel retrieval & cleanse right there on scene

All done & You Get Moving Again

When we have finished you should be able to get back on the road and get on with your day

Wrong Fuel Drain Specialists

We are the leading wrong fuel drain specialists in the UK, offering countrywide service, for BMW motorists particularly. We mostly attend to:

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

We are BMW specialists and have successfully drained thousands of Petrol BMW vehicles. Even if it is roadside, on a station forecourt, or even at your house, we can get you moving again.

The Process

The method of removing Diesel from a Petrol car is fundamentally exactly the same for most cars. Naturally it does differ a bit as every brand has their unique different fuel system. Having said that it still generally follows the below 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 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

In the event that you have any enquiries or need some assistance please Contact Us!
We can get you moving once again.

24/7 BMW Helpline

0333 366 0103

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

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