I know pretty much everything about late 80s to early 90s Mercedes models. The W124 series in particular. It's an unhealthy obsession though, you can spend an infinite amount of money on these cars and still end up with things to fix.
Totally understandable, I just managed to break free from my car hobby, a but. Down to only 6 hobby cars. Toyota Celica and Volvl 700/900 series were the issue here. I managed to get a wire and loads of pets, no time anymore for extensive car hobby. (So down to 2 Celicas, 2 Volvo 340s and 2 780s)