Which E53 do you have? Depending on mileage and since you are already in there, you may want to change out the Tie rods, Sway Links, Thrust arm. As for the motor, besides doing the Valve Cover Gaskets; you may want to consider doing the Spark plugs. And again, knowing which one you have and mileage will help us determine what else once you are in there.

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2011 E70 50i M Sport