I am new to the VW world so all of you will need to forgive me.
I just purchased a 1990 G60 from Japan with 9800 KM's on it. Everything is mint on the car with the exception of this bad cabin vibration.
When the car is at idle I notice the vibration a bit but it is crazy at highway speeds. When up to speed I can release the clutch and gas and the car rolls so smooth but still with a smaller vibration like at idle.
There is no wheel imbalance, ot steering wheel shake.
I have checked the forums for engine mounts, exhausts, upper strut supports, but I still need some help on nailing down this problem.
Andrew