Hello everyone and thanks already. I'm a newbie here and also a first time Mercedes owner. I purchased a 1988 300CE last month. A two-owner, 120k mile, mint condition, previously owned by two elderly ladies, Diamond Blue with chrome wheels California car in excellent condition. It had a resonating vibration at idle, however, which disappeared once underway. After reading this forum, I purchased engine mounts from the Mercedes dealer and had them installed by my mechanic. The difference this repair made was tremendous. No shake or resonance at idle now -- none. One of the old mounts was indeed ruptured with no fluid remaining. If you are having this symptom with yours, I highly recommend this repair. Thanks again to the members who previously discussed this issue. This forum is very useful.