Smoke, oil consumption, and fuel trim issues with various fault codes can be traced to an internal leak at the oil separator.Google+
Car Problem Reports
Porsche Boxster S Various Faults Due to Intenal Leak at the Oil Seperator
Porsche Boxster S Problem
The Aos becomes more brittle with intermittent usage. ie infrequent use or lots of short journeys , it is driver use style which determines replacement intervals not the frequency or type of oil change . In uk it costs about £300 to resolve all in but unless you are competent under the hood dont go there
Visitor, 2009 Porsche Boxster S, 11,781 mi
Mach 2014: fault identified oil separator. Replaced at dealer.