What to do if you put the wrong fuel in your car explained by motoring expert walesonline.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from walesonline.co.uk Daily Mail and Mail on Sunday newspapers.
According to the RAC, there are about 150,000 incidents of "misfuelling" in the UK every year - and it can be a costly mistake to make for drivers who mix up petrol and diesel