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You can scroll down and see a thread with a poll on how many of us hear the same noise. I also mentioned in that thread that I recall reading that an updated oil pressure relief valve consisting of the piston and spring is supposed to take care of that. Basically the reasoning behind it is that the worn one starts to leak and allows the oil to bleed down vs a new one will keep more oil at the top of the engine for extended periods of time when the car is parked.
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