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I ran the original 98 AOS for 8 years and 80 track days in my 2.5L BSX Boxster. An oil overfill by my "trusted" shop resulted in it's demise and I replaced it with stock OEM and ran another 40 track days with the new one.
My brother and I ran identical BSX cars at the pointy end of the time sheet in PCA Time Trials with around 200 track days between us. The stock OEM AOS proved to be very reliable. Our experience suggests that if you keep the oil level *just at the top of the gauge or dip stick you will not likely have a problem running stock. An oil overfill kills em quick.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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