Radiator leak in the first month I owned the car. Replaced it with a new one.
The dynamo broke down after 8 months. It was possible to repair it.
Rust on the back-side around the wheels. Had to have an expert to put in new pieces left and right and resprayed.
This car is the most comfortable car I ever owned. The automatic gearbox runs very smooth and when the engine is warm, the car is fast enough.
No need to rush in a car like this one.
I don't know about you, but my 1977 W123 240D can only be described as a jewel it has crossed the french alps 40 times has more than 450000klm on it is still running smoother than most modern cars, sure it has a little bit of rust on the rear wheel-arch panels, but this was a car that was built way before mercedes introduced rust-protection. Sure it might not be the fastest car out there, but In 28 years of ownership I have rarely visited the service station for other than routine maintenance, whereas my new w211 e-class has had to visit the official dealership more than 8 times. If only I knew that recent Mercedes quality was this bad I would have never replaced the w124.