AOS Oil/Air Separator. Porsche Boxster 986 1997-02 – Porsche Boxster/Cayman

Oil separator. One of the most common failures on the Boxster or 996 is the air/oil separator, also known as the AOS. The AOS is essentially a small membrane distiller that distills, liquefies, and returns tiny amounts of oil mist in the crankcase to the crankcase. Porsche part number: 99610702304. Manufacturer: OEM / Original Equipment Quality.

• Porsche Boxster 986 2.5L 1997-99
• Porsche Boxster 986 2.7L 1999-02
• Porsche Boxster S 986 3.2L 1999-02

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