What condition are your drive belts in? I recently replaced all my belts and some intermittent squeaking went away. I think the two inner-most belts were original and one was so distorted that it twisted around midway.

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Mark Herzig
1995 E300D 153K
1985 300D 142K (sold)
1979 450SL 122 miles (sold)
1992 500E 127K (sold)
1987 300SDL 132K (sold)
1986 300E 161K (sold)