Bad fuel in a Mercedes CLS 55 AMG? Diesel in your Petrol Mercedes?

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Mercedes Fuel Drain


Filling up with Diesel in a Petrol Mercedes is a fairly typical mistake to make. And exactly what you have to do about it is based on several different factors. Assuming you want to find out what it is best to do to fix it then keep on reading.
Here are the most important variables to take into account whenever choosing whether or not to have a fuel drain:

  1. What level of Diesel have you put into the Mercedes, taking into account that the fuel capacity of the Mercedes CLS 55 AMG is most likely around 80 litres?
    1. Hardly any Diesel, something like 4 litres of Diesel in a Petrol CLS 55 AMG will quite often not really be a significant problem. Experience has demonstrated to us that anything under 4 litres (which is roughly 5% of the total fuel tank capacity) is often able to be sufficiently diluted simply by totally filling up the tank with Petrol.
      It is extremely uncommon to come across a motor vehicle experiencing issues with under 5% wrong fuel contamination. Remember that it's infrequently found - in no way impossible to find. There are actually some vehicles that won't stand any quantity of fuel contamination in the slightest.
    2. Anywhere between 4 and 8 litres of Diesel in the Mercedes (5 to 10%) is more of a 50/50 situation. Our practical experience has shown that as many people get away with it as all those who don't. When trying to decide whether to risk it and basically top it up bear in mind that it is exactly like wagering all of it on black - you will have a 50/50 possibility of it working.
    3. Anything in excess of 8 litres of Diesel in your Petrol CLS 55 AMG really should right away be removed seeing that your probability of driving with that level of contamination is in all likelihood lower than one in 50 - definitely huge odds.
  2. Put Diesel in a Petrol Mercedes and drove it: Have you observed any performance issues since putting the wrong fuel in the CLS 55 AMG? If you have, have it emptied irrespective of the volume of Diesel or even the contamination ratio. Continuing to drive driving an automobile that is already starting to suffer from the effects of wrong fuel contamination can definitely bring about progressively more damage being done to the fuel system parts.
  3. Are you interested in reassurance?
    Then simply just get it removed. Whatever the contamination percentage, there is inevitably some extent of threat associated with operating a Petrol engine on Petrol contaminated with the incorrect fuel. Probable consequences of driving on the incorrect fuel include the motor refusing to start, running lumpy, reduced power, wearing of the high-pressure pump, damaged or blocked injectors, and so on. These are some of the commonest Diesel in Petrol symptoms, and if you observe any of them then stop and get it drained asap.

Avoid having any jack-of-all-trades to attend your car. We are Mercedes specialists and have got the certification and experience necessary to ensure that you are back on the road with no hassle or worry.

Put Diesel in a Petrol Mercedes

Unintentionally put Diesel in a Petrol Mercedes? Or perhaps even put contaminated fuel in your Mercedes CLS 55 AMG?

Contact us for Assistance & Recommendations

Call us and obtain honest recommendations and practical help for your specific circumstance

We come out and do the fuel drain

We are able to go to you to do the full fuel removal & flush there on scene

All done & You Get Going Again

As soon as we are done you should be able to get back on your way and get on with your day

Wrong Fuel Drain Specialists

We are the leading wrong fuel drain experts in the UK, having countrywide service, for Mercedes motorists particularly. We primarily attend:

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

We are Mercedes specialists and have successfully drained hundreds of Petrol Mercedes vehicles. Even if it is at the roadside, on a station forecourt, or even at your house, we are able to get you on the road again.

The Procedure

The procedure of getting rid of Diesel from a Petrol vehicle is fundamentally similar for the vast majority of vehicle makes. Obviously it may vary a little as every brand has their own distinct fuel system. Having said that it still generally observes the following guidelines:

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.

Contact Us

If you have any concerns or require our help please Call us!
We can get you going once again.

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0333 366 0103

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

Weekdays: 9am to 5pm

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