Bad fuel in your Mercedes ML 450 CDI? Petrol in your Diesel Mercedes?

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


Putting Petrol in a Diesel Mercedes is a fairly typical error. And its solution varies according to a number of things. If you want to know what you must do about this then please read on.
Listed here the key factors to be aware of whenever figuring out whether or not to have a fuel drain:

  1. What level of Petrol did you put into the Mercedes, keeping in mind that the fuel capacity of the Mercedes ML 450 CDI is in most cases around 95 litres?
    1. A tiny quantity of Petrol, something like 4.75 litres of Petrol in a Diesel ML 450 CDI will most of the time not necessarily be a significant problem. Experience has proven to us that quantities less than 4.75 litres (about 5% of the fuel tank) is frequently capable of being adequately diluted by entirely filling up the remainder of the tank with the right fuel.
      It's extremely unusual to find a motor vehicle experiencing difficulties due to under 5% wrong fuel contamination. Do not forget that it is very infrequent - not impossible to encounter. You will discover a number of motor vehicles that don't endure any level of contamination at all.
    2. Between 4.75 and 9.5 litres of Petrol in the Mercedes (from 5 to 10%) is really a 50/50 condition. Our expertise demonstrates that as many people get away with it as those who don't. When you are deciding on whether or not to risk it and just fill it up recognise that it is just like wagering your car on black - you have a 50/50 possibility of it working out.
    3. Anything in excess of 9.5 litres of Petrol in a Diesel ML 450 CDI really should promptly be removed seeing that your probability of getting away with this level of contamination is very likely lower than one in 50 - truly huge odds.
  2. Put some Petrol in a Diesel Mercedes and drove it: Have you observed any performance concerns as a result of putting the wrong fuel in the ML 450 CDI? If so, get it drained irrespective of the quantity of Petrol or the contamination percentage. Continuing to run driving an automobile that is starting to suffer from the consequences of fuel contamination can typically result in more harm being done to your fuel system.
  3. Are you looking for assurance?
    Then get it removed. No matter the contamination percentage, there is invariably some amount of danger connected with driving a Diesel motor on Diesel contaminated with the wrong fuel. Possible final outcomes of driving on the wrong fuel include the motor refusing to start, running unevenly, loss in power, wearing of the high-pressure pump, worn out or bunged injectors, etc. These are some of the most typical Petrol in Diesel signs and symptoms, and should you recognise any of them then stop and get it removed as soon as possible.

Don't just get any jack-of-all-trades to try to repair your car. We are Mercedes specialists and have got the certification and knowledge necessary to ensure that you are back on the road with a minimum of hassle or trouble.

Put Petrol in a Diesel Mercedes

Unintentionally put Petrol in a Diesel Mercedes? Or perhaps even put contaminated fuel in your Mercedes ML 450 CDI?

Contact us for Help & Recommendations

Call us and obtain genuine advice and practical assistance for your specific circumstance

We arrive and do the fuel drain

We are able to go to you to perform the full fuel drain & purge right there on scene

All done & You Get Going Once again

Once 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 top rated wrong fuel drain professionals in the UK, offering national cover, for Mercedes motorists particularly. We typically deal with:

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

We are Mercedes specialists and have successfully drained hundreds of Diesel Mercedes vehicles. Regardless of whether it is roadside, on a station forecourt, or even at your home, we can get you on the road once again.

The Procedure

The method of extracting Petrol from a Diesel car is essentially the same for most vehicles. Of course it does differ a bit as each make has their unique fuel system. Even so it still 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

Petrol in Diesel Questions

When someone has put Petrol in a Diesel car they have a few very common questions. So we have compiled a list of the most Frequently Asked Questions for you

I put Petrol in a Diesel 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 Diesel car on Petrol 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 Petrol can I get away with in a Diesel 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 Diesel 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

Should you have any questions or need some help please Call us!
We are able to get you on the road again.

24 hour 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