Bad fuel in your Mercedes S350 CDI? Petrol in your Diesel Mercedes?

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


Filling Petrol in a Diesel Mercedes is a regularly occurring mistake to make. And exactly what you have to do about it is determined by several factors. If you would like to know what you have to do to fix it then read on.
Listed below are the main variables to to consider whenever deciding on whether to get a fuel drain:

  1. What level of Petrol have you put in to the Mercedes, bearing in mind that the fuel tank capacity of your Mercedes S350 CDI is in most cases approximately 90 litres?
    1. Hardly any Petrol, less than 4.5 litres of Petrol in a Diesel S350 CDI will quite often not be a significant problem. Experience has taught us that anything less than 4.5 litres (which is almost 5% of the fuel tank capacity) is very often capable of being adequately diluted simply by totally filling up the rest of the tank with Diesel.
      It is relatively uncommon to encounter an automobile going through difficulties due to below 5% wrong fuel contamination. Please remember it is rare - certainly not impossible to encounter. There are actually a few motor vehicles that don't endure any amount of fuel contamination in the slightest.
    2. Anywhere between 4.5 and 9 litres of Petrol in the Mercedes (5 to 10%) is more of a 50/50 condition. Our practical experience has shown us that as many motorists get away with it as all those who don't. Any time you're deciding upon whether to chance it and just simply fill it up consider that it is very much like wagering it all on black - you have a 50/50 possibility of it being ok.
    3. Anything in excess of 9 litres of Petrol in your Diesel S350 CDI really should right away be removed since your likelihood of driving with this amount of contamination is undoubtedly less than one in fifty - seriously huge odds.
  2. Put some Petrol in a Diesel Mercedes and drove it: Have you noticed any performance difficulties as a result of putting the incorrect fuel in the S350 CDI? If that's the case, have it drained irrespective of the quantity of Petrol or even the contamination percentage. Continuing to drive driving a car that is currently beginning to suffer from the effect of wrong fuel contamination can likely end up in increasing amounts of damage affecting the fuel system.
  3. Do you need peace of mind?
    In that case get it removed. No matter the contamination ratio, there is always some amount of risk associated with operating a Diesel vehicle on fuel contaminated with Petrol. Likely implications of driving on the wrong fuel include things like the motor not starting, running unevenly, lack of power, wearing of the high-pressure pump, worn out or blocked injectors, and so forth. These are several of the most frequently seen Petrol in Diesel symptoms, and if you recognise any of them then stop and get it drained immediately.

Steer clear of having any unqualified mechanic to try to fix your automobile. We are Mercedes specialists and have the certification and expertise needed to make sure that you are back on the road with minimum hassle or trouble.

Put Petrol in a Diesel Mercedes

Accidentally put Petrol in a Diesel Mercedes? Or even put contaminated fuel in your Mercedes S350 CDI?

Contact us for Assistance & Recommendations

Give us a call and obtain honest recommendations and sensible help for your precise circumstance

We show up and drain it

We would go to you to carry out the full contaminated fuel removal & flush there on scene

All done & You Get Moving Once again

Once we are done you are able to get back on your way and get on with your day

Wrong Fuel Drain Specialists

We are the primary wrong fuel drain specialists in the UK, offering countrywide coverage, for Mercedes motorists in particular. We predominantly attend to:

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

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

The Procedure

The process of removing Petrol from a Diesel vehicle is essentially exactly the same for the majority of vehicle makes. Obviously it can differ a little as every make has their own distinct fuel system. However it still fundamentally observes the following points:

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 FAQs

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.

Call us

If you have any queries or need our assistance please Contact Us!
We are able to get you going 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