Much depends on the usage pattern of the previous owners. Ours was a second owner with meticulous service record and older folks. As a result, everything is in perfect working order, ac included, if you can find r-12. Hell, all my tank gauges still work. Again good maintenance and using public potties where available. Vent covers get brittle,etenabond is your friend. The patience and ability to reseat windows, doors, and locating service information so not to shell out 100 per hour for maintenance. Now, belts, hoses, mechanical add-ons, all have a useful life. These are easily replaced. Chassis and internal engine components, now there is the gamble. What it comes down to is good intuition and lots of luck. Enjoy.