Join Date: Feb 2007
Location: Just outside of Phila., PA
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Mine has been doing this since day one (2007). Take a look at sig and see how strong it runs with minor mods. I have 8,300 miles and still no issues except the noise.
Have tried the 15w50 Mobil one, oil additives, ZMax, etc. Not going to worry about it (it's embarassing at car shows when you go to pull away !).
Have not take to dealer, although it was in for a recall notice and they did not say anything when they started it up inside the repair bays (I was standing there, and heard it clearly).
I've heard every theory from throttle blades rattling to bad lifters, etc. I've put a stethoscope on every single part of the engine and it appears to be from on side, drivers side, up near water pump and throttle body.
I figure if it lets go, that's what a warranty is for. But since it is running so well, I am ignoring it for now.