Hey Ed, I own an 1983 633csi and maybe I can give you a few cogent issues and points to look for. First you have to differentiate somewhat between pre-83 and post-83 models. The latter sharing a different suspension of the e28 5series. I have also read about quality issues regarding the pre-1983 models (though this might have scant validity and I have no 1st hand experience). From what I glean from others, pre-1982 6ers were assembled by Karmann, the body designer/manufacturer. BMW took this over in 1983 due to reliability issues concerning their assembly; though, if a car is 18 years old or more it’s a good case for quality. I feel the 6er, given the long build span is quite an evolution with some tradeoffs- mostly in the technology department. The earlier models obviously have less, but this in my view is not always bad (i.e. simplicity). This is especially relevant to 633/635 differences. A fundamental difference in the later 633 models (1984) is the ability to add performance chips more easily, that is if you plan to mod. your vehicle. Otherwise, problems to look for in later 633’s are similar to 635’s. I think the big three which were mentioned to me when I was purchasing were Driveshaft problems, Control Arm bushings, and HVAC issues. The first two are well covered in the FAQ and cause shimmy and vibration problems for different reasons. The latter is just expensive to repair (especially AC), though maybe not common. Smaller problems have to do with electrics and interior (i.e. Service Interval battery replacement and age deterioration) and have common remedies. What worked for me pre-purchase was reading the FAQ front to back, and scanning this board wholesale for awhile. It gave me a good idea what to look from seeing repetitive posts on certain issues. Others certainly will have things to add to this list. Jeremy Walton’s Book, The 6-Series Companion, would also be a good read for the History of the model. Good luck, Chris
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