I have recently started getting a cyclical vibration at speeds around the above. It repeats about every five seconds. As an obscure reference, it is similar to what you get in a twin-engined plane when the prop speeds are not synchronized? Is something like this as simple as needing the wheels re-balanced? (This is with the CLK500)

Momo

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1990 500SL 65k km - until May 11 2004
2004 E320 4-Matic wagon
2004 CLK500 Cabrio from May 11 2004