Boxster racers and hpde folks: what oil do you run and how often do you change it?

[steved0x]

Some good data points, thank you.

[Topless]

I ran Castrol 5W40 full synthetic for 10 years and changed it every 3k miles. Compression was still good when I sold the car at 112k miles and 100+ track days. Noticeably less startup chatter than with 0-40 I used before.