Wrong Fuel
Unleaded instead of leaded
Stop filling up if you've put in a couple of litres then finish filling up with leaded and your engine should be fine.
Diesel instead of petrol
The tank will need to be drained, cleaned and then refilled with petrol so you will need professional help.
Petrol instead of diesel
You will need to have the tank drained cleaned and refilled with diesel before you can drive the car. Call for help.

