Hi Duffy, I can only comment on my own S8 but my gearbox is really smooth too, at 125,000 miles and rising. My gearbox oil was changed by IT if I remember rightly, maybe 5000 miles ago.
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Audi D3 S8 - 2007 - V10. B&O, Phantom Black, black and silver interior, and still completely standard with everything working as it should 
Audi TT - 2015 - Ultra
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