Incorrect fuel in a Mercedes SL 350? Diesel in a Petrol Mercedes?

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


Filling up with Diesel in a Petrol Mercedes is a usual problem. And what you should do about it will depend on a variety of things. In case you want to find out what you must do to fix it then read on.
Right here are the most crucial variables to keep in mind when making a decision whether to get the car drained:

  1. What amount of Diesel have you put in to the Mercedes, taking into consideration that the fuel capacity of the Mercedes SL 350 is in most cases around 80 litres?
    1. A modest quantity of Diesel, less than 4 litres of Diesel in a Petrol SL 350 will generally not necessarily be a significant problem. Experience has proven to us that anything under 4 litres (which is 5% of the total fuel tank volume) is frequently able to be adequately diluted by entirely filling up the remainder of the tank with the correct fuel.
      It is quite unusual to come across a vehicle suffering from issues with below 5% incorrect fuel contamination. Remember that it is very uncommon - in no way impossible to encounter. There are some automobiles that will not stand any degree of contamination whatsoever.
    2. Somewhere between 4 and 8 litres of Diesel in the Mercedes (5 to 10%) is really a 50/50 situation. Our practical experience has revealed that as many motorists get away with this as those who break down. Any time you're deciding on whether or not to chance it and just fill it up remember that it is exactly like betting your car on black - you will have a 50/50 chance of it being ok.
    3. Anything over 8 litres of Diesel in your Petrol SL 350 must straightaway be drained out because your likelihood of succeeding with this quantity of contamination is in all likelihood less than one in fifty - genuinely long odds.
  2. Put Diesel in a Petrol Mercedes and drove it: Have you detected any kind of performance issues since putting the incorrect fuel in the SL 350? If so, have it emptied no matter the volume of Diesel or even the contamination percentage. Still running a motor vehicle that is starting to suffer the effects of wrong fuel contamination can likely lead to increasing amounts of damage being caused to your fuel system parts.
  3. Do you need security?
    Simply get it drained. Regardless of contamination ratio, there is inevitably some extent of danger caused by operating a Petrol engine on Petrol contaminated with Diesel. Likely implications of driving a vehicle on the wrong fuel normally include the engine not starting, running lumpy, decrease in power, wearing of the high-pressure pump, worn or blocked injectors, and so forth. These are some of the most common Diesel in Petrol warning signs, and in the event that you detect any of them stop and have it drained right away.

Steer clear of having any jack-of-all-trades to attend your vehicle. We are Mercedes experts and have got the credentials and expertise required to ensure you are back on the road with no hassle or trouble.

Put Diesel in a Petrol Mercedes

Inadvertently put Diesel in a Petrol Mercedes? Or even put contaminated fuel in your Mercedes SL 350?

Give us a call for Assistance & Advice

Call us and receive honest guidance and practical assistance for your exact circumstances

We show up and drain it

We are able to come to you to perform the contaminated fuel drain & clean right there on scene

All done & You Get Moving Once again

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

Wrong Fuel Drain Specialists

We are the primary wrong fuel drain professionals in the UK, having nationwide cover, for Mercedes motorists particularly. We predominantly attend to:

  • Unleaded petrol in a Diesel Vehicle
  • Diesel in your Unleaded Petrol Vehicle
  • AdBlue fuel contamination
  • Water contamination

We are Mercedes specialists and have successfully drained hundreds of Petrol Mercedes vehicles. Whether it is roadside, on a station forecourt, or even at your home, we can get you moving once again.

The Procedure

The process of getting rid of Diesel from a Petrol vehicle is in essence similar for the majority of vehicles. As you can imagine it can vary to some extent as every brand has their own distinct fuel system. Having said that it still generally adheres to the following guidelines:

Petrol in Diesel Mercedes

Fuel Drain

Empty the Fuel Tank

View more
Wrong Fuel Drain Mercedes

System Flush

Clean out the fuel lines & pumps

View more
Petrol in Diesel Drain Mercedes

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 queries or need assistance please Call us!
We can get you going once again.

24/7 Mercedes Helpline

0333 366 0103

Our Business Office

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

Weekdays: 9am to 5pm

Important Info

Fully Insured

VAT Registered

APEX Certified


Fully Mobile

Professionally Trained