This is what I got from a sticky over at TDIClub.com advising people to stick with vw fluid in their tranny.
Viscosity Comparison @ 100 C
6.3 = OEM G52 (part numbers G052726A2 / G05272601)
10.6 = Redline MTL 70-80
13.8 = Amsoil MTG 75-90
15.2 = Motul Gear 300 75-90
15.6 = Redline MT-90 75-90
15.0 = Elf Tranself Synthese FE 75-90
16.7 = Motul MOTYLGEAR 75-90
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