It sounds like we have the identical vibration. My car has 35k miles. I purchased a good extended warrenty, so if the problem gets worse, I will take it to the dealer for investigation. To me, it feels like a driveshaft, or axle out-of-round. Could be something in the rear end. It also could be a characteristic of the car?

Thanks for the reply, John

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1989 190 E 2.6 148K miles