Genuine Porsche Air Oil Separator AOS

The Genuine Porsche Air Oil Separator (AOS), also called an oil separator or crankcase breather separator, is an original equipment part. It is part of the engine's crankcase ventilation system. It separates oil mist and vapor from the blow-by gases that build up in the crankcase. The cleaned air is routed back into the intake, and the separated oil is returned to the engine.

Key Features:

• Genuine Porsche original equipment quality, built to factory standards
• Removes oil from crankcase vapors before they reach the intake system
• Helps regulate crankcase pressure and supports proper engine ventilation
• Helps limit excess oil consumption and oil carryover into the intake
• Helps reduce emissions and keep the intake tract cleaner

A worn or failed air oil separator can cause symptoms such as rough idle, increased oil consumption, white smoke from the exhaust, or crankcase ventilation faults. Replacing it with a genuine Porsche part restores the factory ventilation function and helps protect long-term engine performance. Select the child item that matches your application to get the correct part number.