Contaminated fuel in your Subaru Impreza? Diesel in a Petrol Subaru?

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


Filling up with Diesel in a Petrol Subaru is a regularly occurring mistake to make. And exactly what you need to do about it depends upon a number of factors. Assuming you want to know what you must do to fix it then continue reading.
Listed below are the main factors to consider when deciding whether to have a fuel drain:

  1. What level of Diesel did you put into the Subaru, considering that the fuel capacity of your Subaru Impreza is most likely around 50 litres?
    1. A tiny quantity of Diesel, less than 2.5 litres of Diesel in a Petrol Impreza will generally not really be a big problem. Experience has proven to us that an amount less than 2.5 litres (which is 5% of the total fuel tank capacity) is sometimes able to be sufficiently diluted through wholly filling the rest of the tank with the correct fuel.
      It's very rare to come across a car going through issues with below 5% incorrect fuel contamination. Keep in mind it's unusual - definitely not impossible to encounter. There are a number of cars that will not endure any level of fuel contamination in the slightest.
    2. Between 2.5 and 5 litres of Diesel in the Subaru (5 to 10%) is a 50/50 scenario. Our working experience demonstrates that as many motorists get away with it as those who break down. Any time you're figuring out whether to chance it and just top it up recognise that it is very much like wagering your car on black - you will have a 50/50 possibility of it working out.
    3. Anything over 5 litres of Diesel in a Petrol Impreza must straightaway be drained since your probability of succeeding with this level of contamination is more than likely lower than one in fifty - extremely huge odds.
  2. Put some Diesel in a Petrol Subaru and drove it: Have you spotted any kind of performance difficulties as a result of putting the incorrect fuel in your Impreza? If you have, get it drained irrespective of the amount of Diesel or the contamination percentage. Continually running a vehicle that is starting to suffer from the effect of fuel contamination can only bring about more and more damage being caused to the fuel system components.
  3. Are you looking for reassurance?
    You should get it removed. Regardless of the contamination percentage, there is invariably some extent of danger associated with driving a Petrol motor on fuel contaminated with the wrong fuel. Probable results of driving a car on the wrong fuel include things like the engine not starting, running unevenly, decrease in power, wearing of the high-pressure pump, damaged or clogged injectors, and the like. These are some of the most common Diesel in Petrol symptoms, and if you recognise any of them stop and have it removed asap.

Refrain from having any unqualified mechanic to attend your car. We are Subaru specialists and have got the credentials and expertise required to make certain that you are back on the road with little hassle or worry.

Put Diesel in a Petrol Subaru

Unintentionally put Diesel in a Petrol Subaru? Or possibly even put contaminated fuel in your Subaru Impreza?

Give us a call for Assistance & Advice

Call us and obtain reliable advice and sensible assistance for your specific circumstances

We come out and do the fuel drain

We can go to you to carry out the complete fuel drain & cleanse right there on scene

Once performed You Get Going 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 leading wrong fuel drain authorities in the UK, offering nationwide coverage, for Subaru motorists especially. We principally deal with:

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

We are Subaru specialists and have successfully drained hundreds of Petrol Subaru vehicles. Whether it's at the roadside, on a petrol station forecourt, or even at your home, we can get you on the road once again.

The Process

The method of getting rid of Diesel from a Petrol car is generally identical for a large number of vehicle makes. As you can imagine it may differ a little as every make has their particular fuel system. However it still basically observes the below principles:

Petrol in Diesel Subaru

Fuel Drain

Empty the Fuel Tank

View more
Wrong Fuel Drain Subaru

System Flush

Clean out the fuel lines & pumps

View more
Petrol in Diesel Drain Subaru

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.

Call us

In the event that you have any enquiries or require help please Contact Us!
We are able to get you on the road again.

24 hour Subaru Helpline

0333 366 0103

Our Corporate Office

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

Important Info

Fully Insured

VAT Registered

APEX Certified


Fully Mobile

Professionally Trained