I have ~107,000 miles on my 2000 Boxster S, I bought it about 4,700 miles ago. it had an oil change as part of the LN IMS bearing at that time and I haven't had to add any. It currently has Mobile One 0W40, I am getting ready to do my first oil change at 5,000 with Castrol Edge with Syntec 5W40 (or whatever the new name of the formula is)
Steve