My moms 06 boxster did this the other day, she called me up franticly that smoke was billowing out of the engine. I was only a few minutes away she drove it over. Some times the check engine light will also be triggered. As core seller said take of the oil cap while running and if there is a good vacuum pulling the cap down, it is a very good sign it is the AOS. My bet is AOS as it is a pretty common problem.
AOS is about $100 and it is pretty easy to install if you have a car hoist. You might also want to clean out your intake and check your air filter to make sure no oil went up that way !
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