Incorrect fuel in your BMW 525xi? Diesel in a Petrol BMW?

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


Filling Diesel in a Petrol BMW is a regular mistake to make. And its remedy is determined by various factors. In case you would like to find out what it is best to do about this then continue reading.
Here are the most crucial factors to be aware of when determining whether to have it drained:

  1. What level of Diesel did you put into the BMW, taking into account that the fuel capacity of the BMW 525xi is probably roughly 70 litres?
    1. A modest quantity of Diesel, something like 3.5 litres of Diesel in a Petrol 525xi will most of the time not necessarily be a huge problem. Experience has proven to us that quantities less than 3.5 litres (about 5% of the fuel tank volume) is in many instances able to be adequately diluted through totally topping up the remainder of the tank with the right fuel.
      It's very uncommon to come across a vehicle going through problems because of lower than 5% wrong fuel contamination. Remember that it's infrequently found - definitely not impossible to find. You will discover certain vehicles that don't stand any amount of fuel contamination in the slightest.
    2. Between 3.5 and 7 litres of Diesel in the BMW (from 5 to 10%) is really a 50/50 scenario. Our practical experience demonstrates that as many motorists get away with this as all those who break down. When deciding upon whether or not to risk it and simply fill it up remember that it is the same thing as betting it all on black - you have got a 50/50 chance of it being ok.
    3. Anything more than 7 litres of Diesel in your Petrol 525xi should as soon as possible be drained because your probability of getting away with that quantity of contamination is more than likely lower than one in 50 - extremely huge odds.
  2. Put Diesel in a Petrol BMW and drove it: Have you seen any kind of performance concerns ever since putting the bad fuel in your 525xi? If that's the case, have it emptied regardless of the amount of Diesel or the contamination percentage. Continuing to run running a vehicle that is currently starting to suffer from the effects of fuel contamination will likely lead to more and more harm affecting the fuel system.
  3. Are you looking for reassurance?
    Then simply just get it drained. Regardless of the contamination ratio, there is invariably some amount of risk linked with operating a Petrol vehicle on fuel contaminated with the incorrect fuel. Likely results of driving on the incorrect fuel normally include the engine not starting, running lumpy, loss of power, wearing of the high-pressure pump, damaged or clogged injectors, etc. These are several of the most typical Diesel in Petrol signs and symptoms, and should you observe any of them then stop driving and get it removed immediately.

Don't just get any unqualified mechanic to attend your automobile. We are BMW specialists and possess the skills and expertise required to make certain you get back on the road with little hassle or trouble.

Put Diesel in a Petrol BMW

Inadvertently put Diesel in a Petrol BMW? Or perhaps even put contaminated fuel in your BMW 525xi?

Call us for Assistance & Recommendations

Contact us and get straightforward advice and sensible help for your specific circumstances

We show up and do a fuel drain

We are able to come to you to undertake the contaminated fuel retrieval & clean right there on scene

Once performed You Get Going Once again

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

Wrong Fuel Drain Specialists

We are the top rated wrong fuel drain specialists in the UK, having national cover, for BMW motorists especially. We typically attend:

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

We are BMW specialists and have successfully drained thousands of Petrol BMW vehicles. Regardless of 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 procedure of getting rid of Diesel from a Petrol car is in essence the same for most vehicle makes. Obviously it may vary to some degree as every brand has their own distinct fuel system. However it still generally observes 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 require our assistance please Call us!
We can get you going once 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