Ouch! Overfilling with oil can kill the AOS pretty quick.
I use Econolube for annual oil changes but not without a Porsche inservice seminar with the service tech first. I assume they no nothing about a Porsche.
1. I supply the oil, filter, crush ring and specialty tools .
2. Drain for 20 minutes warm.
3. Required torque settings.
4. Fill with 8.5 qts only, I will top off tomorrow.
$20 bucks
I prefer this method to doing it myself in the garage and then disposing of the used oil later.