I suppose my first car- nova 1.2. Only because it was old and therefore rotten as hell underneath and things were starting to no longer work, heater for example!!!

Had bad luck with my mk6 escort cabby. Cost me £750 within the fist week of buying it from a bloody garage. (It was in Warrington, says it all. Dripped petrol after i filled it up and they wouldnt help me unless i drove it back up the motorway 30odd miles with fuel dripping out of the tank. A 'reputable' garage then fitted the wrong petrol tank and fucked the sender unit).

Car that cost me the most in repairs was my MR2. Most awkward thing to have work done on and everything is expensive!