In the 5ktq, it's GL-4 in the transmission, and GL-5 in the rear diff -
mixing up the two will damage the brass synchros in the transmission.
Searching www.audifans.com comes up with:
According to the Bentley, the 4kq transmission takes SAE 80W or 80W/90, GL4,
and the rear diff takes SAE 90, GL5.
1987 Audi 5kTQ
1980 Audi 5k
1962 and '64 Auto Union DKW Junior deLuxes
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