Might want to read post #5 in...
http://986forum.com/forums/boxster-general-discussions/77579-should-i-change-my-transmission-oil.html
It's gear oil. You don't have to change it TODAY. Order it, wait a few days, do the swap. Pricey, I suppose. But do you want to have second thoughts about putting the other stuff in there?
Besides, it's not motor oil...how often you doing this?