As a student i dont recommend u buying an old merc, as they start to get old they require more maintenance also these cars we have in Pk have very small frugal engines not meant for doing sliding, burnout etc remember these cars are now senior citizens so we treat them as such.
There are plenty of threads on PWs regarding ownership and maintenance of mercedes ,you should probably go through them before making a decision , rest a few oldtimers from the golden era of PWs are still active they can guide u better