Took the car out for a spin on a new section of interstate today - absolutely flat asphalt, a rare find here in New Orleans.

The car was perfectly smooth - no symptoms at all.

Shortly thereafter, I returned to our regular roads and all of the symptoms reappeared - lots of steering wheel oscillation and shimmy.

It is acting like the steering linkage can't handle rough roads.

Anyway, the plan on Friday is to swap front wheels/tires with another S class and see if the symptoms persist.

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Paul