I put some WD40 to the rear shocks area to quiet the noise, it did work a little bit. I took my car to the tire shop yesterday, the guy told me that was not a big deal of problem, at least not a safety problem. But he told me it is better off to replace all four shocks and struts. (I am not sure they have never been changed or not, how do I find out the info.?) He mentioned some brand name but did not quote me the price yet. (It seems that he does not have much knowledge of Mercedes). In case I need to replace all shocks and struts, can anyone tell me which brand I should pick, What kind of shop to go to ?How much is for the complete job? Thanks a lot.

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89 300 CE