I just bought an '88 300 TE for a song at a local wholesale auction. The car is clean and the rumble (the reason it went so cheaply) is a bad rear driveshaft flex connector ($40). So I want to know what else I need to look for and what the known problems are for this beast. It has 172k mi.

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1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
1989 560 SL (Reassembly after paint job) 160K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (still running strong with an upgraded cam) 349K
1986 242Ti (deceased)
1968 GT500KR (under restoration)