Found a sedan, spent two days running around the map to find tires, battery and sparkplug. Finally found some barrels so I could stuff tires in there so it wouldn't be lost on server reset. Finally got four tires, battery and the plug last night (tuesday) and just needed to run back to the car and attach them today (wednesday).
Logged in today, car was gone. Very low-pop server, but its possible that someone else got to that remote location, found the car, scrounged up four tires, battery and a spark plug and drove away, but I think its unlikely, because I had another location where another sedan was in a similar state. It *too* was gone. One I could believe, but both seems really unlikely... but I could be wrong.