Incorrect fuel in your BMW 435i? Diesel in a Petrol BMW?

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BMW Fuel Drain


Putting Diesel in a Petrol BMW is a regular error. And its remedy is determined by several different factors. If you would like to know what you should do to sort it out then stay with me.
Listed here are the key factors to consider whenever determining whether or not to have the car drained:

  1. Exactly how much Diesel have you put into the BMW, considering that the fuel capacity of the BMW 435i is normally approximately 60 litres?
    1. Hardly any Diesel, less than 3 litres of Diesel in a Petrol 435i will normally not be a big problem. Experience has proven to us that an amount under 3 litres (about 5% of the whole fuel tank volume) is in many instances able to be adequately diluted simply by thoroughly topping up the tank with the right fuel.
      It is quite unusual to encounter a motor vehicle having issues with lower than 5% incorrect fuel contamination. Remember that it is very infrequent - certainly not impossible to find. You can get some vehicles that will not stand any amount of contamination in the slightest.
    2. Anywhere between 3 and 6 litres of Diesel in the BMW (5 to 10%) is more of a 50/50 condition. Our experience has shown us that as many motorists get away with this as those people who break down. When you are deciding upon whether or not to chance it and simply top it up remember that it is much like gambling everything on black - you will have a 50/50 possibility of it working.
    3. Anything above 6 litres of Diesel in a Petrol 435i should really right away be drained out seeing as your probability of succeeding with that amount of contamination is more than likely below one in 50 - truly long odds.
  2. Put Diesel in a Petrol BMW and drove it: Have you observed any performance problems after putting the wrong fuel in your 435i? If that's the case, have it removed no matter the volume of Diesel or the contamination ratio. Still driving a car that is beginning to suffer from the effects of fuel contamination will probably typically bring about progressively more harm being done to the fuel system.
  3. Are you looking for assurance?
    You should get it removed. Whatever the contamination percentage, there is always some degree of risk resulting from operating a Petrol engine on fuel contaminated with Diesel. Possible final outcomes of driving on the incorrect fuel include things like the motor not starting, running unevenly, lack of power, degradation of the high-pressure pump, worn out or bunged injectors, etc. These are some of the commonest Diesel in Petrol warning signs, and if you notice any of them cease driving and get it drained immediately.

Keep away from getting any unqualified mechanic to try to fix your car. We are BMW specialists and hold the skills and experience necessary to ensure you get back on the road with minimum hassle or worry.

Put Diesel in a Petrol BMW

Unintentionally put Diesel in a Petrol BMW? Or even put contaminated fuel in your BMW 435i?

Give us a call for Assistance & Advice

Give us a call and receive sincere guidance and sensible help for your particular circumstance

We show up and drain it

We can reach you to do the full contaminated fuel removal & clean right there on scene

All done & You Get Going Again

When we are done you will be able to get back moving and get on with your day

Wrong Fuel Drain Specialists

We are the leading wrong fuel drain experts in the UK, boasting nationwide service, for BMW motorists in particular. We predominantly fix:

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

We are BMW specialists and have successfully drained hundreds of Petrol BMW vehicles. No matter if it is roadside, on a station forecourt, or even at home, we can get you moving once again.

The Procedure

The method of removing Diesel from a Petrol vehicle is essentially identical for most vehicles. Needless to say it can vary to some extent as every brand has their particular distinct fuel system. Even so it still follows 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

If you have any concerns or want assistance please Contact Us!
We are able to get you moving once again.

24 hour BMW Helpline

0333 366 0103

Our Corporate Office

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

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