Contaminated fuel in your Mercedes Viano CDI? Petrol in a Diesel Mercedes?

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


Putting Petrol in a Diesel Mercedes is a regular problem. And its remedy depends on a few factors. If you want to find out what it is advisable to do about it then continue reading.
Here are the key factors to to consider whenever determining whether or not to have the car drained:

  1. How much Petrol did you put in the Mercedes, taking into consideration that the fuel tank capacity of the Mercedes Viano CDI is normally approximately 75 litres?
    1. A tiny quantity of Petrol, something like 3.75 litres of Petrol in a Diesel Viano CDI will generally not be a huge problem. Experience has taught us that anything less than 3.75 litres (which is close to 5% of the total fuel tank) is often capable of being sufficiently diluted simply by wholly filling the tank with Diesel.
      It is quite rare to encounter a vehicle experiencing difficulties because of under 5% wrong fuel contamination. Keep in mind it is uncommon - definitely not impossible to encounter. There are a number of cars that won't stand any degree of contamination in the slightest.
    2. Anywhere between 3.75 and 7.5 litres of Petrol in the Mercedes (from 5 to 10%) is more of a 50/50 situation. Our working experience has shown that as many people get away with it as those people who don't. Whenever deciding whether to risk it and simply fill it up consider that it is very much like betting all of it on black - you will have a 50/50 possibility of it working out.
    3. Anything over 7.5 litres of Petrol in a Diesel Viano CDI really should promptly be drained since your likelihood of succeeding with that quantity of contamination is certainly lower than one in fifty - genuinely long odds.
  2. Put some Petrol in a Diesel Mercedes and drove it: Have you detected any kind of performance problems as a result of putting the bad fuel in the Viano CDI? If you have, get it removed irrespective of the quantity of Petrol or the contamination percentage. Proceeding to run driving an automobile that is starting to suffer the consequences of fuel contamination can only lead to more damage affecting your fuel system parts.
  3. Do you want reassurance?
    Then simply just get it drained. Whatever the contamination ratio, there is invariably some amount of threat caused by operating a Diesel motor on Diesel contaminated with the incorrect fuel. Likely implications of driving on the wrong fuel include things like the engine refusing to start, running unevenly, loss in power, degradation of the high-pressure pump, worn out or blocked injectors, and so forth. These are a few of the commonest Petrol in Diesel signs and symptoms, and should you detect any of them then stop and get it removed right now.

Do not just have any jack-of-all-trades to try to repair your vehicle. We are Mercedes experts and hold the skills and expertise required to make certain that you get back on the road with a minimum of hassle or worry.

Put Petrol in a Diesel Mercedes

By mistake put Petrol in a Diesel Mercedes? Or perhaps even put contaminated fuel in your Mercedes Viano CDI?

Call us for Help & Guidance

Give us a call and obtain sincere recommendations and practical help for your exact circumstances

We arrive and do the fuel drain

We would go to you to perform the complete contaminated fuel retrieval & flush right there on scene

All done & You Get Going Again

When we have finished you are able to get back on the road and get on with your day

Wrong Fuel Drain Specialists

We are the leading wrong fuel drain specialists in the UK, boasting national service, for Mercedes motorists especially. We principally fix:

  • Unleaded petrol in your Diesel Vehicle
  • 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. No matter if it is roadside, on a petrol station forecourt, or even at your house, we are able to get you moving again.

The Procedure

The technique of removing Petrol from a Diesel vehicle is fundamentally similar for a large number of cars. Of course it may differ slightly as every make has their particular distinct fuel system. However it still generally adheres to the below principles:

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.

Contact Us

Should you have any concerns or need our assistance please Call us!
We can get you going 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