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I'd be surprised if the 996 Turbo has an air/oil separator, oil vapor would be routed back to the reservoir just like all the air cooled Mezgers that came before it.
I purchased this car Used I'm not sure what they had before but I've put 0W-40 Now myLow or pressureSignal light Stays on. 987 Boxster 2007
FYI, You are posting in the 996 turbo forum which has a completely different engine than what is in a boxster. With that being said, the M96/97 motor design (like what is in your boxster and n/a 996) has a multitude of design issues, one of them being bearing wear that causes low oil pressure.