My 98 C230 had noises from the right rear. The dealer replaced the differential mounts, which helped some. They said the rest might be shocks, but I installed koni sport shocks, which didn't change the noise at all. They then replaced the rear 'sway bar assembly' under warranty, which got rid of the rest of the noise.

Also, I notice that whenever the drop down rear seat back is down on the right, there is a squeaking noise. This noise is there if the seatback is not completely latched as well. Firmly latching the seatback eliminates this noise.

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John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E