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Pinarelloman · 08-12-2011, 11:53 AM

It could be a few things, but first guess would be the AOS (air oil separator). A quick check to tell if it is this is to start the engine and then remove the oil filler cap. If there is a strong vacuum when you are removing the cap, then the AOS is failing.
Search on here for AOS, Lots of info.

08-12-2011, 11:53 AM	#2
Pinarelloman Registered User Join Date: Jun 2009 Location: Australia Posts: 105	It could be a few things, but first guess would be the AOS (air oil separator). A quick check to tell if it is this is to start the engine and then remove the oil filler cap. If there is a strong vacuum when you are removing the cap, then the AOS is failing. Search on here for AOS, Lots of info. __________________ Dave. 2001 Boxster S. Speed yellow.