Generally, mine isn't clunky either.

However, I once had a knocking, clunky noise coming from the front suspension which could be felt in the wheel when cornering over rough roads. I changed the ant-roll bar (sway bar) bushes. Cost about GBP10. Cured the problem. What's your mileage? It may be that some of the rubber is starting to go.

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JJ Rodger
2013 G350 Bluetec
1999 SL 500
1993 E300 diesel T
1990 190