You also shouldn't rule out some of the other advice given above.

It could also be a flex disc, center support bearing, or differential mount.

If you have a flex disc going out, and it fails while driving, it could cause some damage.

You really should take the car to an independent mechanic that specializes in Mercedes to give the car a once over.

It could be the cheapest $60 you'll ever spend.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".