Cracked strut tower bushings may cause knocking noise on front end on Mercedes-Benz 300D

Problem Description and Possible Solution
A knocking noise from the front end can be caused by cracked strut tower bushings.
Problem Data
RepairPal Verified
Average mileage: (–)
4 model years affected: 1990, 1991, 1992, 1993
5 people reported this problem
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this noise is also coming from my 2009 e350 they have replaced front struts 3 times and it is doing it again