ugh, I have searched AND searched, and I can't seem to retrieve that page...I read it sooo long ago (almost two years ago)It basically explained the problem you're having, and IIRC, It was due to oil not reaching one of the cam lobes right away (like on startup), due to excessive wear on the lobe, and/or clogged oil passages (they are tiny) at the back end of the camshaft can't remember if it was cyl #5 or 6......It basically stated that it doesn't pose a threat to your engine, it is just a little annoying, sorry I can't be of more help. hopefully someone will chime in that knows, or has read the same page...
In the meantime, have someone start it up, and you put your ear at the rear of the motor, and try and determine if it is coming from under the valve cover (camshaft)