Aslong as they've been serviced regularly and cambelts etc are in place, then they are good to go. Other thing I read on a forum somewhere, is they can be picky about where you get diesel from. Aparantly all the detergants supermarket diesel has in it, it cleans the tank out and pulls all of the shit through your fuel pump, thus knackering it, its quite a common problem from what I read. Other than that, bullet proof