You shouldn't have to live with anything....something's wrong and it's their obligation to fix it. It didn't drift when it left the assembly line, so it shouldn't now! If the local tech can't ID the problem, ask that they contact the regional tech support person...or you'd be more than happy to do so on their behalf. Do NOT settle...something's wrong and it needs to be fixed. In an emergency situation, your condition poses a risk that NO MBZ tech would ever want to see out on the road.

Stay with it and let us know.

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Best regards, Michael
'92 500E
'88 300TE