Both rear window regulators needed to be replaced.
Nothing else other than normal maintenance.
The W123 is an incredible car. I started out with a W116 300SD, but eventually needed a wagon and found this car still with its original owner. I'm fortunate in that we have a local Mercedes-only service shop run by a German ex-MB factory employee, so needless to say, he knows these cars inside and out and seems to always have a three week backlog for work.
In any case, we had these cars in my family back in the 1970s and 1980s, and I still remember how they felt when they were brand new.
It was made very clear to me that these cars require regular maintenance, which must be adhered to strictly, so my car is in every 3K miles for oil changes, every 15K for valve adjustments and fuel filters, 30K for air filter and trans fluid and filter, annually for brake fluid flush, and every second year for coolant flush, and it has been dead reliable in the near 20 years I've owned it.
You'll run into wear items needing replaced at certain mileage intervals, so don't be surprised when it needs ball joints and control arms at 150K, or brake hoses at 25 years old, or A/C work, etc... it's a machine and machines - even great ones - still wear out, but compared to many other cars, including my wife's brand new C-Class, the W123 is in a league of its own in comfort, safety, simplicity and reliability.
Would you buy another car from this manufacturer? Yes
Review Date: 8th July, 2014