Possibly air/oil seperator (AOS) failing. A quick test - with engine hot and idling, try removing the oil fill cap - if its difficult to remove (vacuum present) its the AOS.
Some track people also use a competition AOS, and deep sump kit to help combat oil surge in the sump and if you'r really keen an extra anti-surge oil pump in the cylinder heads + pressurised supplimentary oiling system.
Use the search function for more info or see Boxster Racing Forum section.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
Last edited by Steve Tinker; 04-27-2014 at 12:41 AM.
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