Date registered: Jul 2004
Mentioned: 7 Post(s)
Quoted: 52 Post(s)
I haven't kept track of the things you've done, but subframe mounts/motor mounts are suspect and one of the first places to look if they have never been replaced. It's easy to see collapsed subframe mounts; motor mounts are a lot trickier to diagnose without actually removing anything, although it might be possible to make a measurement of engine height against a car with new mounts, or if you dare, watch the engine while accelerating the engine.
FWIW, at 84K and 18 years, my subframe mounts were shot (one actually disintegrated); my driver's side motor mount was broken and my right side mount was crushed. The car had been driven by "little old ladies" for 15 of the most recent previous 18 years until I bought it.
I and others have reason to suspect that broken motor mounts contribute to the infamous "broken radiator neck" problem, in that the motor jumps around and pulls on the neck via the (very tight) upper radiator hose.
Replacing these parts for the home mechanic is doable, but not easy and considerable safety precautions are involved.
Homebrew MB First Gear Start!