My noise was only on cold starts as well. I have heard someone describe it as a "cam phaser" noise. I don't know what that is, but it sounds similar to what you've heard. I also don't know how a choice of oils could affect whether it occurs or not. Maybe someone else on BITOG could explain that.
EDIT: I was just doing some reading about variable cam timing on wikipedia. Apparently there is a valve that shoots engine oil onto the cam phaser at startup. Perhaps this is the noise we are hearing. I also wonder if maybe there is something about Synpower that coats better than other oils I've tried and, therefore, I don't hear the noise at startup as often.
Does this seem plausible to anyone?
EDIT: I was just doing some reading about variable cam timing on wikipedia. Apparently there is a valve that shoots engine oil onto the cam phaser at startup. Perhaps this is the noise we are hearing. I also wonder if maybe there is something about Synpower that coats better than other oils I've tried and, therefore, I don't hear the noise at startup as often.
Does this seem plausible to anyone?
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