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NORMAL, NORMAL, NORMAL.
I can't imagine why you guys go to the lengths you do.. Analyzing the noise via spectrum analyzer, lol!!!
This is a normal noise and probaly due to some check valve that allows the oil to drain back overnight or when the car sits. Think about when you change you oil. Unless you prime the motor (crank w/out starting to build oil pressure) the first start after an oil change makes some noise as the engine has no oil in it for a split second until it's running.
Yes, the noise is annoying, but it is what it is (BTW both my M3 have done this)
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