Wrong fuel in a Mercedes R300 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 fairly typical error. And exactly what you should do about it is determined by an assortment of factors. In the event that you want to find out what you have to do to sort it out then continue reading.
Let us discuss the most important variables to be aware of whenever choosing whether or not to get a fuel drain:

  1. How much Petrol did you put in the Mercedes, taking into consideration that the fuel capacity of your Mercedes R300 CDI is in most cases roughly 80 litres?
    1. A small quantity of Petrol, less than 4 litres of Petrol in a Diesel R300 CDI will quite often not really be a huge problem. Experience has taught us that anything under 4 litres (which is about 5% of the fuel tank volume) is usually capable of being adequately diluted by thoroughly filling the tank with the correct fuel.
      It is relatively uncommon to encounter a vehicle experiencing issues because of less than 5% incorrect fuel contamination. Bear in mind that it is very uncommon - in no way impossible to encounter. There are actually some vehicles that will not stand any level of fuel contamination in the slightest.
    2. Somewhere between 4 and 8 litres of Petrol in the Mercedes (5 to 10%) is more of a 50/50 condition. Our expertise has demonstrated that as many drivers get away with this as all those who break down. When deciding whether to risk it and just simply top it up bear in mind that it is the same thing as betting everything on black - you will have a 50/50 chance of it being ok.
    3. Anything in excess of 8 litres of Petrol in your Diesel R300 CDI really should immediately be drained out because your likelihood of getting away with this amount of contamination is undoubtedly less than one in fifty - truly huge odds.
  2. Put Petrol in a Diesel Mercedes and drove it: Have you observed any kind of performance issues as a result of putting the incorrect fuel in the R300 CDI? If so, get it emptied irrespective of the volume of Petrol or the contamination ratio. Proceeding to run driving a car that is now beginning to suffer the effect of fuel contamination can typically cause increasing amounts of harm affecting the fuel system.
  3. Do you need peace of mind?
    Simply get it removed. Whatever the contamination ratio, there is always some extent of risk in connection with driving a Diesel motor on Diesel contaminated with the wrong fuel. Probable outcomes of driving a car on the incorrect fuel normally include the engine not starting, running unevenly, loss in power, wearing of the high-pressure pump, worn or bunged injectors, and so on. These are several of the most typical Petrol in Diesel signs and symptoms, and in the event that you detect any of them then stop driving and have it removed immediately.

Refrain from having any untrained so-and-so to try to repair your car. We are Mercedes specialists and hold the certification and working experience required to make sure that you get back on the road with minimum 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 R300 CDI?

Contact us for Assistance & Recommendations

Call us and get genuine advice and practical assistance for your precise situation

We show up and drain it

We can go to you to do the complete fuel removal & cleanse there on scene

Once performed You Get Going Again

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

Wrong Fuel Drain Specialists

We are the top rated wrong fuel drain experts in the UK, offering countrywide cover, for Mercedes motorists especially. We mainly attend:

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

We are Mercedes specialists and have successfully drained thousands of Diesel Mercedes vehicles. No matter if it's at the roadside, on a station forecourt, or even at your house, we can get you moving again.

The Procedure

The process of extracting Petrol from a Diesel vehicle is essentially similar for a large number of motor vehicles. Obviously it can differ somewhat as every brand has their particular distinct fuel system. However it still generally follows 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 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.

Call us

If you have any queries or require some assistance please Call us!
We can 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