Contaminated fuel in your Mercedes C350? Diesel in a Petrol Mercedes?

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Mercedes Fuel Drain


Putting Diesel in a Petrol Mercedes is a regular problem. And what you need to do about it will depend on several things. Assuming you want to find out what it is advisable to do about this then stay with me.
These are the most important variables to to consider whenever deciding whether to have a fuel drain:

  1. How much Diesel did you put into the Mercedes, considering that the fuel capacity of the Mercedes C350 is in most cases approximately 62 litres?
    1. Hardly any Diesel, something like 3.1 litres of Diesel in a Petrol C350 will most of the time not really be a big problem. Experience has proven to us that an amount less than 3.1 litres (which is close to 5% of the overall fuel tank capacity) is in many instances capable of being sufficiently diluted by means of completely filling up the rest of the tank with the correct fuel.
      It is rather rare to encounter a car having difficulties due to less than 5% incorrect fuel contamination. Do not forget that it's infrequently found - certainly not impossible to find. You will discover a number of vehicles that will not stand any level of contamination whatsoever.
    2. Anywhere between 3.1 and 6.2 litres of Diesel in the Mercedes (5 to 10%) is really a 50/50 scenario. Our practical experience has revealed that as many people get away with it as all those who don't. Any time you're figuring out whether to chance it and just simply top it up bear in mind that it is much like betting everything on black - you have got a 50/50 possibility of it working out.
    3. Anything above 6.2 litres of Diesel in a Petrol C350 should really right away be drained out because your probability of driving with that quantity of contamination is undoubtedly below one in fifty - truly long odds.
  2. Put Diesel in a Petrol Mercedes and drove it: Have you detected any performance concerns as a result of putting the incorrect fuel in your C350? If so, get it emptied regardless of the volume of Diesel or the contamination percentage. Still driving a vehicle that is now starting to suffer the effect of fuel contamination will probably typically lead to more and more harm affecting the fuel system.
  3. Would you like reassurance?
    In that case get it drained. Regardless of the contamination ratio, there is always some amount of risk connected to driving a Petrol motor on fuel contaminated with the wrong fuel. Probable outcomes of driving a car on the wrong fuel can include the engine refusing to start, running lumpy, decrease in power, degradation of the high-pressure pump, worn out or bunged injectors, and so forth. These are several of the most frequently seen Diesel in Petrol signs or symptoms, and in the event that you detect any of them then stop driving and have it removed as soon as possible.

Avoid getting any jack-of-all-trades to attend your car. We are Mercedes specialists and hold the accreditation and working experience needed to ensure that you are back on the road with a minimum of hassle or worry.

Put Diesel in a Petrol Mercedes

Unintentionally put Diesel in a Petrol Mercedes? Or even put contaminated fuel in your Mercedes C350?

Contact us for Help & Guidance

Give us a call and get straightforward guidance and practical help for your exact situation

We show up and drain it

We can go to you to do the fuel retrieval & clean there on scene

All done & You Get Going Once again

As soon as we have finished you will be 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 specialists in the UK, boasting countrywide coverage, for Mercedes motorists especially. We mainly deal with:

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

We are Mercedes specialists and have successfully drained hundreds of Petrol Mercedes vehicles. Regardless of whether it's roadside, on a station forecourt, or even at your house, we are able to get you going once again.

The Procedure

The system of extracting Diesel from a Petrol vehicle is essentially the same for most vehicles. Needless to say it may differ a bit as each manufacturer has their unique distinct fuel system. Nevertheless it still essentially follows the following points:

Petrol in Diesel Mercedes

Fuel Drain

Empty the Fuel Tank

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Wrong Fuel Drain Mercedes

System Flush

Clean out the fuel lines & pumps

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Petrol in Diesel Drain Mercedes

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 queries or want some help please Call us!
We can get you going again.

24/7 Mercedes Helpline

0333 366 0103

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

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