Try rear alignment? Toe in adjustment?
Leaking shocks/ struts?
Old Differential fluid?
I'd check on rear toe in alignment. don't want rear tires pointing in too much like this.... / \
IF rears face forwards like that, not good.
It is not a camber up down, its a toe adjustment. IT can make a wobbling noise/ vibration.
I'm having mine checked out soon...
Find a place that can do a 4 wheel full alignment on a mercedes. if you havent had this done already, I don't think it can hurt...
Definately have it checked though, I would...
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.