I've liked Mercedes, and I've hated Mercedes. Have had four of them, all but one pre-"E" models. That last one was a 300E and it was nothing much but trouble. Won't starts, two A/C compressors and a turbo take a big toll and some of the nickle and dime stuff like power windows and locks, dashlights, and brakes could drive a calm person insane. The older cars were two 300D sedans and a 240D sedan. The 240 was unbeatable but S-L-O-W. That car was one of the kind that you know will keep chugging along no matter what. A tank. Bulletproof and still is - my old one, a '78, just crossed 700,000. It got an engine that was longblock new at $2400. while I had it at 450,000. The others, 81 and '84 300Ds, were also nice but for the endless turbo quirks. Mercedes knew the turbo wouldn't hold seals ao they warranted the thing for as long as the car is on the road no mater who owns it. Far as I know that's still in place. I liked them best for the hard seat, the body tightness, and the pretty nice handling. They are the little brother to the big 300SD - almost the same but littler.
All parts are 30% higher than they should be, seems like, and the parts people are snobby jerks in my experience.