Each of the 3 W123s I have bought seem to require similar repairs when I get them. On all of them the thermostat is bad and the car is overcooling, the factory key has been lost and replaced with a now worn out brass key, and the electric sunroof (if applicable) is fubar.

What have you noticed commonly needs repair on your "new" cars?

__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine