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It sounds like it is drive train related, not an engine vibration. It could be an out of round tire, but I think it is some badly worn suspension component or components that have more stress on them as you go faster. Use the search function and see what you come up with.
By the way, where are you and what chassis and engine is your car?
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Doug
1987 300TD x 3
2005 E320CDI
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