Many thanksDifferent. ATF fluid is used for the mech unit and gearbox oil for the actual mechanical gears.
Audi itself recommend ATF fluid be changed. The gear oil along with differential oil should be good for 50k miles.
Full gearbox servive includes the oil and filter.
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Invoice shows 69.23p for gear oil@andyay123 in the other thread where you provided a photo of your invoice - here - and it only showed the parts for the engine oil change. If there's another page you could show we can confirm that it was ATF. Should be about £90 worth of oil and filter.