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I'll let JFP chime in with some insight, he always has good thoughts. But would look into what he does mention about the oil pump.
Your last oil change, how much did you put in? seeing any oil leaks on the engine itself underneath?
My first thought is a lifter issue. Depends on the noise cause it could also be the cam pads/chains, but that is usually persistent not just on startup. I would put something in like seafoam right before your next oil change. Such as drive it for 20-40 miles with seafoam and then change your oil & filter. Let the oil drain for an hour and then fill. If it helps then maybe do it 1 more time.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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