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^^^ Steve beat me to it as I was typing ^^^
As long as its easy to remove the oil fill cap, you (normally) don't have a failing AOS, but if you want to sure, remove the throttle body & AOS to manifold vacuum line and check for pooling oil.
The engine will run poorly with the cap removed as you are introducing a big vacuum to the system....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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