Weissach may have Swepco 201.
Open the refill plug before draining the transmission to be sure you can fill after.
The shallow Allen hex in the plug can make things tricky.
You'll need a 17?mm socket with a sharp edge to bite into the hex; normal L-shaped Allen wrenches will not work.
I grind the end of the socket flush so it has a bite and I use a little penetrating oil on the threads first.
I like 15W40 Diesel Shell Rotella for a number of reasons, climate is just one of them.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD!
1995 seafoam-green 993 C2, LSD, Sport seats.

Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ".