1. Yes, plug the offending vacuum line and it will shut off. Both my cars had this
2.Yep, both cars, related to #1
3. Yes, needed glow plugs or controller, fixed.
4. Sure, they are 32-40 year old cars. Oil cooler lines were the worst for me-Oil pan gasket too. Fixed both
5. Yes, previous owner never cleaned sunroof drains. I did, sealed tracks as best I could and stay dry now.
6. No. Proper lubrication goes a long way.
7. Yes, as I type with the 300d. 240d was a manual. Often stuck in 2nd.
8. Rubber insulators replaced on both of my W123s, braket was never busted.
9. No
10. Normal wear for any vehicle, I replace 2 tie rods on my 240d, drag link on my 300d
11. Nope.

Like everyone else says, no cruise control, tach went out, odometer works when it wants to...but we love these cars anyway, right?

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82 240d 4 speed manual. stripped parts car-PM me for requests
85 300d daily driver. Nice reliable beater always a work in progress unknown miles-odom works when it wants
95 E300d. daily driver or trip taker 220k
97 F250 4x4 7.3 turbo ext cab, 8'bed
78 Pontiac Bonneville-my 1st car bought new by parents, my high school graduation present in 1988-sits in garage. needs to come out of mothball