Wrong fuel in a BMW 335i? Diesel in a Petrol BMW?

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BMW Fuel Drain


Filling up with Diesel in a Petrol BMW is a regularly occurring error. And what you need to do about it is determined by several different factors. Assuming you want to find out what it is best to do to fix it then please read on.
Listed here are the main variables to take into account when deciding on whether or not to have it drained:

  1. How much Diesel did you put in the BMW, considering that the fuel tank capacity of the BMW 335i is in most cases about 63 litres?
    1. A small amount of Diesel, as little as 3.15 litres of Diesel in a Petrol 335i will most of the time not necessarily be a huge problem. Experience has proven to us that quantities under 3.15 litres (5% of the whole fuel tank capacity) is in many instances able to be adequately diluted by thoroughly filling up the rest of the tank with Petrol.
      It is quite unusual to encounter a car or truck having problems due to less than 5% wrong fuel contamination. Remember that it's infrequent - not impossible to find. You can get a few automobiles that won't stand any level of fuel contamination at all.
    2. Between 3.15 and 6.3 litres of Diesel in the BMW (from 5 to 10%) is more of a 50/50 situation. Our practical experience has shown that as many people get away with this as those people who don't. Any time you are deciding whether or not to chance it and basically top it up consider that it is very much like betting it all on black - you have got a 50/50 chance of it working.
    3. Anything in excess of 6.3 litres of Diesel in your Petrol 335i ought to as soon as possible be drained out because your likelihood of succeeding with this level of contamination is more than likely below one in fifty - extremely big odds.
  2. Put Diesel in a Petrol BMW and drove it: Have you noted any performance troubles as a result of putting the wrong fuel in your 335i? In that case, get it emptied no matter the quantity of Diesel or the contamination percentage. Continually driving an automobile that is beginning to suffer from the effect of wrong fuel contamination will only cause more and more harm being caused to the fuel system.
  3. Are you interested in assurance?
    Then simply just get it drained. Whatever the contamination percentage, there is inevitably some degree of danger resulting from operating a Petrol engine on fuel contaminated with Diesel. Likely consequences of driving a vehicle on the wrong fuel normally include the motor not starting, running lumpy, reduced power, wearing of the high-pressure pump, worn or bunged injectors, and so forth. These are several of the most typical Diesel in Petrol signs or symptoms, and if you notice any of them stop and get it removed right away.

Don't simply have any unqualified mechanic to attend your vehicle. We are BMW experts and possess the qualifications and experience required to ensure that you are back on the road with no hassle or trouble.

Put Diesel in a Petrol BMW

Mistakenly put Diesel in a Petrol BMW? Or perhaps even put contaminated fuel in your BMW 335i?

Contact us for Assistance & Recommendations

Call us and obtain reliable advice and sensible assistance for your particular situation

We show up and do a fuel drain

We would reach you to perform the complete fuel retrieval & purge there on scene

Once done You Get Going Again

When we have completed you are able to get back on the road and get on with your day

Wrong Fuel Drain Specialists

We are the top rated wrong fuel drain authorities in the UK, having nationwide cover, for BMW motorists particularly. We mostly attend:

  • Unleaded petrol in your Diesel Vehicle
  • Diesel in 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 roadside, on a filling station forecourt, or even at home, we can get you on the road once again.

The Process

The technique of getting rid of Diesel from a Petrol car is essentially the same for the vast majority of vehicles. Obviously it may differ to some degree as every brand has their particular different fuel system. However it still generally 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 case you have any concerns or need our 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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