Wrong fuel in a Audi A4? Diesel in your Petrol Audi?

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Audi Fuel Drain


Putting Diesel in a Petrol Audi is a common mistake to make. And what you have to do about it depends on several things. In case you want to know what you need to do about this then please read on.
Listed below are the most important factors to be aware of whenever choosing whether or not to get a fuel drain:

  1. What level of Diesel did you put in to the Audi, keeping in mind that the fuel tank capacity of your Audi A4 is probably approximately 62 litres?
    1. A small quantity of Diesel, less than 3.1 litres of Diesel in a Petrol A4 will generally not be a big problem. Experience has shown us that quantities less than 3.1 litres (which is close to 5% of the overall fuel tank volume) is oftentimes capable of being sufficiently diluted through thoroughly topping the tank with the correct fuel.
      It's quite unusual to encounter a car or truck going through problems with below 5% wrong fuel contamination. Please remember it is very unusual - not impossible to encounter. You will discover a number of cars that will not endure any amount of fuel contamination whatsoever.
    2. Somewhere between 3.1 and 6.2 litres of Diesel in the Audi (from 5 to 10%) is really a 50/50 scenario. Our practical experience has demonstrated that as many people get away with this as those people who break down. Any time you're deciding upon whether to risk it and just fill it up recognise that it is just like gambling your car on black - you've got a 50/50 chance of it working.
    3. Anything in excess of 6.2 litres of Diesel in a Petrol A4 really should promptly be removed seeing that your likelihood of getting away with this level of contamination is certainly lower than one in fifty - genuinely big odds.
  2. Put Diesel in a Petrol Audi and drove it: Have you observed any kind of performance concerns after putting the incorrect fuel in your A4? If so, have it drained irrespective of the volume of Diesel or even the contamination ratio. Continuing to run running a vehicle that is now beginning to suffer from the effect of wrong fuel contamination will probably likely cause even more damage affecting the fuel system components.
  3. Do you need reassurance?
    In that case get it removed. No matter the contamination percentage, there is always a certain level of risk connected with running a Petrol motor on Petrol contaminated with the incorrect fuel. Probable outcomes of driving on the wrong fuel normally include the engine refusing to start, running unevenly, decrease in power, wearing of the high-pressure pump, damaged or clogged injectors, etc. These are a few of the most common Diesel in Petrol symptoms, and if you observe any of them stop driving and get it drained as soon as possible.

Don't just get any general so-and-so to attend your car. We are Audi experts and possess the credentials and knowledge necessary to make sure that you get back on the road with little hassle or trouble.

Put Diesel in a Petrol Audi

Inadvertently put Diesel in a Petrol Audi? Or possibly even put contaminated fuel in your Audi A4?

Call us for Help & Recommendations

Call us and obtain genuine advice and practical help for your particular circumstance

We arrive and do a fuel drain

We can go to you to perform the complete fuel retrieval & purge right there on scene

Once carried out You Get Moving Once again

Once we are done you will be able to get back moving and get on with your trip

Wrong Fuel Drain Specialists

We are the top rated wrong fuel drain experts in the UK, having national coverage, for Audi motorists in particular. We mainly attend:

  • Unleaded petrol in Diesel Car
  • Diesel in Unleaded Petrol Auto
  • AdBlue fuel contamination
  • Water fuel contamination

We are Audi specialists and have successfully drained thousands of Petrol Audi vehicles. Whether it's at the roadside, on a filling station forecourt, or even at your house, we are able to get you moving again.

The Procedure

The process of draining Diesel from a Petrol vehicle is fundamentally identical for virtually all motor vehicles. Of course it does vary a bit as every make has their own different fuel system. Having said that it still fundamentally observes the below points:

Petrol in Diesel Audi

Fuel Drain

Empty the Fuel Tank

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Wrong Fuel Drain Audi

System Flush

Clean out the fuel lines & pumps

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Petrol in Diesel Drain Audi

Vehicle Restart

Get the car up and running again

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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.

Get in Touch

In case you have any concerns or need assistance please Contact Us!
We are able to get you going once again.

24 hour Audi Helpline

0333 366 0103

Our Corporate Office

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


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