I have the same problem on a 2000 S80. I just had the wheels balanced today and the problem is also still there ... Let me know how it goes with your mechanic, and i'll do the same for you!!

I have a 2000 S80, It is shaking at around 75MPH ... I just have all 4 wheels balanced and I am still having the same problem ... Any Ideas? I do have a broken top engin mount ... could this cause it? Any help would be appreciated.
Cheers,
Derek