If the steering wheel rocks side to side at 20 mph, you have a tire with a broken belt. Inspect for obvious tire damage. jack the car up in front and spin the tires to note a warped tire. Or have a tire shop ck it.

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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.