depending on the VIN it could be a bad balance shaft.....
http://www.mercedesmedic.com/check-my-mercedes-benz-for-balance-shaft-issue-by-vin-m272273/

you can put your VIN into a link on that site and see. by midd 2008 i think they had fixed it but the early ones.....

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James 4:8

"...let us put aside the blindness of mind of those who can conceive of nothing higher than what is known through the senses"
-Saint Gregory Palamas, ---Discourse on the Holy Transfiguration of Our Lord God and Savior Jesus Christ


Centrally located in North East Central Pa.