M.B. DOC,
Are there any signs of failure to look for? It is more of a rattle than the vibration I have experienced when having to replace motor mounts in the past ( almost like a rough idle ). I got underneath car as best as I could to see if maybe it was a loose heat shield etc but could not detect anything. The car has been stored in a climate controlled environment since new and shows no signs of wear or aging whatsoever ie. cracked rubber , fading etc. What should I expect to pay to replace them if this is indeed the problem? Also, any thoughts on the battery. It is oem now ( I am a big Mercedes oem parts believer ) but am thinking of leaning towards a battery with a longer warranty replacement period, maybe 3 years since the car sits so much. Any particular brands and how do they compare pricewise to oem ( quoted $125 for roadside assistance replacement ). Thanks again for any help.