As some here know recently became the permanent caretaker for my Dad's 85 300SD ( he bought it new) I finally found his overstuffed file of every service done to the car since he took delivery as well as every tank of fuel ever put in the tank ( miles on car where purchased, how much etc). As I went through the receipts I found some items that were replaced more than once and was just curious if the shop pulled a fast one or not. Here are just a few.By the way the car has between 199,000 and 200,000 miles on it.
Air Filter housing bracket- Replaced 5-6 times
A/C compressors, Rcvr Drier, expansion valve everything for the A/c except dash controls replaced 3 times ( maybe more Dad has a 2nd file somewhere)
Engine Mounts replaced 2-3 times.
All front end parts parts replaced at around 150,000 miles.
Rear suspension Links done at the same time.
Also how long should a turbo oil return line expect to last. The one on this car was replaced around 191,000 miles and is leaking so I am not even certain it was ever done.
Anyway it is kinda cool to have all this info as I try to get all maintenance up to spec and then keep it that way. As it turns out the maintenance started to slack off around 2001 when the car had 191,750 miles on it. My Dad's Alzheimers and touch of dementia coincided with it.

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92 500E Silver 66k
82 Porsche 911SC 84K
68 Cadillac ( Gone Now )
03 Suburban Z71 200K
85 300SD 217k From Original Owner ( Dad )