I had this problem in my previous Boxster. I replaced the sump baffle with an aftermarket one in aluminum and always ran my oil level at least 2 or 3 bars below full. Worked for me!
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James
2010 987.2 pdk in speed yellow! 
moved on: 2004 986 S
long gone: 2001 986S tip
YouTube channel: the PORSCHE as seen by NewArt
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