Valve Cover Cap Lid Oil Air Vapor Separator (AOS) Diaphragm Seal Membrane Replacement Repair Kit for 2003-2010 (Porsche Cayenne) 9PA V8 4.5L 4.8L Engine 94810513207 Turbo S 94810513107 High Quality Direct Replacement! - Save Money! 2003 - 2010 - Porsche Cayenne S / TURBO / TURBO S Diaphragm Seal in the Air-Oil Separator is prone to deteriorating. No need to replace the valve cover! FIX SYMPTOMS: Misfire. White smoke from exhaust. Poor running engine. Check Engine Light. Lower Fuel Efficiency Misfire. White smoke from exhaust. Poor running engine. Check Engine Light. Lower Fuel Efficiency