Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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If it sits low in the rear, it may be the camber compensator. It's a hydraulic device that bolts to the pumpkin. The replacement usually fitted is a spring rather than a hydraulic cylinder (much less expensive and complicated). When I had a '72 280SEL 4.5, that fixed the problem for $100 or so (25 years ago).
It's probably the case that all the suspension rubber (mounts, bushings, and so on) need refreshing. Shocks may also be in order. All that will bring the old girl back up square and pretty.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck