Preventative maintenance is the key. I'm always tinkering with my '91, but that's why she sails through mots now.. Going in for underseal when weather warms up, as I'd rather that than start to need welding come mot time etc.. I may thrash her to an indicated 130mph most days, but with a couple of genuine oil changes a year, fluid levels always checked, no ragging until right upto temp, and lots of inspections means that she still purrs like a kitten. Old bangers my arse mines more reliable than the 10year old un-maintained cars my workmates/friends have.. They ask me how my g looks so clean and tidy and looked after, its because I clean tidy + look after it!!