The condition you have described is not that unusual. Remember that the front wheels are correcting for the REAR wheel track & alignment. So if the rear is not tracking correctly & the front end hasn't been adjusted for that(4-Wheel alignment) then the car can "wander"!!
The shake you're talking about is "cowl shake" & SL's can exhibit this condition.
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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS M.B. TECH
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