Another fine transmission lubrication product is SWEPCO.  A gallon or so
costs ~35USD at your local Porsche dealer.  Check with Transaxle Engineering
(818) 998-2739 for more application details.

VORRA swears by it they say.

When you drain the old lubricant, drain it into a clean container then
filter it through a t-shirt on it's way to the recycler.  The magnetic plug
won't catch bronze bits.  The  t-shirt will do a little bit better on those
syncronizer wear indicators.  As a true last resort you can patiently pass
it through a paper coffee filter to get the real scoop.

Examine the remainder by rubbing some of it on your fingers in bright
sunlight.  If it sparkles then there is some particulates from the
syncronizers in the oil.  FWIW this is normal after many thousands of miles.
You'll get less particulates for the same number of miles with a better
lubricant...like swepco or redline.

pensioner