It's more then likely the AOS. Letting the car idle burns off excess oil that was sucked into the intake during normal driving. If you let this go, it will kill your cats among other things.
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2003 Boxster S
| 987 Air Box | K&N Air Filter | 76mm Intake Pipe| 996 76mm TB | 997 Distribution T | Secondary Cat Delete Pipes | Borla Muffler | NHP 200 Cell Exhaust Headers |
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