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thstone · 05-26-2011, 04:45 PM

AOS = air-oil separator. Its an emissions device that collects crankcase gases and routes them back into the intake manifold so they can be burned off, thereby reducing emissions.

05-26-2011, 04:45 PM	#8
thstone Certified Boxster Addict Join Date: Nov 2010 Location: Los Angeles Posts: 7,669	AOS = air-oil separator. Its an emissions device that collects crankcase gases and routes them back into the intake manifold so they can be burned off, thereby reducing emissions. __________________ 1999 996 C2 - sold - bought back - sold for more 1997 Spec Boxster BSR #254 1979 911 SC POC Licensed DE/TT Instructor