I think i have put a340 worth of petrol into my desial car, I didn't notice at the time (very sure it was black desial nozzle) and i am still not certain that this is what i have done, i drove 20 miles from the petrol station with car slightly slugish in low gears but put this down to very very wet and lots of water on the road. Car started this morning then went very jurky and konked out! Not sure what to do right now and how much damage will have been done?