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Rattle at 3000rpm

Engine

Vehicle Information: Model (Boxster, Boxster S,Cayman, Cayman S): Boxster S; Year: 2006; Engine (type, size, modifications): Stock; Total Mileage: 10148; Transmission: Manual;

At 3000 rpm I hear what seems to be valvetrain rattle. It only manifests at this rpm range and disappears as soon as you accelerate through that range or decelerate below it. the noises seem most apparent in first gear although I have heard them using 2nd and accelerating from low rpm occassionally. It also seems to be more apparent when engine is cold.The noises can only be described as a fast rattle and they remind me of tappet noise I heard on my 1965 VW Beetle only a faster rhythm.Any thoughts before I approach my dealer? I am not looking forward to a series of "did you hear that?" questions with the dealer staff.

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