The huge mistake tens of thousands of people make every year that can cost £5,000 or more to fix

Most of us are careful drivers and take care of our cars so as not to make mistakes. But for some reason, they sometimes happen and there is one mistake in particular that can cost you thousands of pounds to correct.

RAC figures suggest that around 150,000 drivers a year in the UK put the wrong fuel in their cars. It is particularly costly as incorrect filling can cause serious engine damage, with replacement parts from some manufacturers costing over £5,000.




Even a fix as simple as emptying the wrong tank of fuel can cost drivers several hundred pounds. In an interview with The Sun, Go Compare’s Tom Banks issued a stark warning: “It can be an easier mistake to make than you think. If you’ve recently changed cars, are borrowing someone else’s vehicle or simply have a lot on your mind when you’re at the petrol station, you could quickly find yourself facing a costly repair bill.” For tips on how to save money, sign up for our money newsletter here

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He suggested that drivers carefully check their insurance policies, as coverage for incorrect refuelling may be included even if it is not clearly stipulated, potentially saving them high costs. He also mentioned that signs of incorrect refuelling may differ depending on whether petrol has been added to a diesel system or the other way around.


If you’ve added gasoline to a diesel vehicle, symptoms may include excessive exhaust smoke and poor acceleration, the check engine light may come on, or the engine may stop running altogether. Conversely, if you’ve added diesel to a gasoline vehicle, the engine may misfire or shut off, accompanied by a large amount of exhaust smoke.

In general, it is more difficult to accidentally fill up a petrol car with diesel, as the nozzle on the diesel pump is usually too large for the opening of the petrol tank. If you realise your mistake while you are still at the petrol station, it is advisable not to leave, Birmingham Live reports.

Instead, put your car in neutral and ask for help to move it to a safe location, then call for professional assistance.