Yes there is rear diff on the rear axle. Best to stick with OEM oils or equivalents instead of generic 75W90 oil.
I don't know about auto box diff oils but 6 speed manual calls for special oil in gearbox + centre and front diffs. Audi recommends one of Castrols Syntrans oils, I don't remember viscosity but it is GL4+ specification. Regular GL4 is not good enough for high pressure hypoid gears and GL5 wears out bronze bushes and synchromesh gears.
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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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