I think the motor industry has got it the wrong way round in its effort to prevent misfuelling. It is impossible to put diesel into a petrol tank but this does little harm except that the car won't start and the tank has to be drained. However, you can still put petrol into a diesel tank which ruins the whole fuel system and those parts of the engine that need the lubricant qualities of diesel thus costing thousands of pounds to put right. They should have made the diesel intake too small to accommodate petrol pumps.