Just remember that there are 3 separate compartments for oil in the gearbox.
1.Gearbox itself that uses ZF Lifeguard 5 about 9.7l
2.Transfer box regular gear oil like GL4, GL5 80W90 about 0.7l
3.Front diff same as transfer box about 1l
If you are just looking to top up whatever oil leaked out because of leaking seal the you need regular gear oil. Also you have not said which of the output seals is leaking, is it one of the front driveshafts or rear output.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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