I used to have some low speed (20~30mph) vibration that would gently shake the entire car. It was caused by one of the front tires having a lateral cut across it. The cut was very shallow and not obviously visible unless one is intently looking for it. I replaced all four tires as they had very little tread left in them any way. The new tires I chose were TOYO Proxes 205/65VR-15 purchased, balanced and installed at Les Schwab. The low speed rocking was completely eliminated but in its place I had steering wheel vibration at 60mph and above. Les Schwab rebalanced all four wheels but that didn’t solve the problem. I took the car to them again but this time I had a heart to heart discussion with the manager. They found out that one of the new tires was out of round. They replaced it and now I can drive it all the way to 100mph and it’s silky smooth. Moral of the story: Check the tires because it seems that the W126's are very sensitive to even seemingly minor tire/balance irregularities.

Cheers

__________________
Riadh
'89 560SL Rauchsilber
And what is good, Phaedrus, and what is not good -- Need we ask anyone to tell us these things?