If PCar dealerships use the wrong oil, your issue is with those Porsche dealerships , not us.
The Forum has discussed this many times with a lot of detail from many well qualified sources.
When you accumulate experience sufficient to challenge JFP and the like ,it will be very useful for us to read your advice. We are always up for saving money and avoiding the Porsche tax.
http://986forum.com/forums/general-discussions/55977-2nd-gear-hard-shift-after-tranny-oil-change-post503743.html#post503743