Yes, such failure does not involve a leak. It's the low mount that fails. BTW I think your mechanic was fair - the accumulators can and often are difficult to replace because of corrosion, and space is confined too. Replacement of the hydraulic shock however usually does not involve much labor. I do all the work myself (I could not afford the car otherwise). Initially I did not, and I can recommend Benz Den in Belmont. He would probably not be cheaper than your mechanic though.
Good luck, Bruno

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1992 300TE 160 kmiles