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I replaced the piston+spring when i did my rebuild ..while you are in there.
From Post above pkp 4911:
"I wish I would have known about this before I took my Boxster S to the track. Despite an increased capacity, modified baffles, I'm pretty sure my engine cavitated on a very hot day but well within a normal rpm range. Oil was also recently changed, however I've also learned that these cars are extremely sensitive to the viscocity as well."
Potentially a terminal situation for your engine !!
Suggest you search "foaming". Known issue in your situation.High detergent oils are the worst. JGDT40 probably the best solution? Also discussed many times on BitoG site. Ford diesel pickups had this issue also.
Baffles/deep sump - some designs are ineffective . Needs a horizontal baffle to prevent oil "climbing" up the walls of the sump ans starving the pickup. The windows in the baffles are another feature to improve. If they don't shut when they should,they are ineffective on longer high g curves.
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