I had a front end clunk in my 95 E320 wagon. Cured after replacing front sway bar bushings. Inexpensive parts and about an hour labor....... Think I'd try this first.

J. M. van Swaay

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1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles