I guess I need to jump in here. Which car would you rather own at ten years of age and 100,000 miles? The 124 was the last of the "engineered like no other car" Mercedes. WShether it is a 300E, 400E, 300CE, or 500E, the 124 will outlast, I'm sure, any other Mercedes built since.
The current E, and the last one too, don't do much for me. The interiors seem tacky, and I would have to go to the dealer to have it serviced. I really like having less electronics. In fact, I love it that my driver's side mirror is not powered, since it's not necessary.

The new MBs are designed to please the first owner or lease person. Mercedes is not terribly interested in the 2nd or 3rd buyer, hence the FSS system that tells you not to change your oil for 12 or 13 thousand miles! Of course, it will make no noticible difference for the first 100,000 miles, but will become a probelm for the 2nd owner.

Tom
92 500E
110,000 miles