mine doesn't shake at all. there is no shake/vibration during idle either, actually less than my other cars, but you can see that the mounts are all cracked up, and when you drive slowly, go over bumps, sudden steep incline, anything where the engine gets jolted around a bit, it grinds and clonks....
i think i'm just to do the mounts for now

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1974 240D, 125K mi, B100 now, SOLD
1980 300TD, 115K mi, 4-speed stick, roll-up windows, greasecar with two tank conversion (daily driver)
1985 300D, 220K miles, greasecar with two tank conversion, SOLD
1993 300D 2.5turbo, 158K miles, green/tan, B20-B50

actually, i think getting oil undercoated a few weeks ago pushed the mounts over the edge. not sure, but that's my sense. i'm sure they were pretty shot to begin with.

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1974 240D, 125K mi, B100 now, SOLD
1980 300TD, 115K mi, 4-speed stick, roll-up windows, greasecar with two tank conversion (daily driver)
1985 300D, 220K miles, greasecar with two tank conversion, SOLD
1993 300D 2.5turbo, 158K miles, green/tan, B20-B50