[BirdDog]

I'm no expert, but if I were you I would have it towed to a Porsche mechanic to determine if you had an IMS failure or if it was the AOS. As others have mentioned, an AOS failure will cause a bunch of smoke, the engine will die (and most likely not restart), and can cause oil to drip out of a bunch of places. That AAA mechanic might not know these engines and could misdiagnose this as an IMS failure (because hey, he read about the IMS problems on the internet, so that has to be what happened!) If it turns out to be the AOS, get that fixed by a Porsche mechanic and then think about having the IMS done.