Gearbox is made by ZF, oil by Esso so You can buy oil either from Audi dealer, ZF or Esso, Esso being cheapest, I do not recall numbers on top of my head but you can find them on net. The thing to consider is that as oil gets older it looses many of it's properties like washing/cleaning and there is more debris in the oil which settles out in corners and crevices. If the oil have not been changed for 100k and you change it later there is a good possibility that fresh oil will lift up old debris that settled out and block small wire mesh filters which will result in loosing couple of gears and slipping clutches because of low pressure. You could still disassemble box and clean it but if you keep driving with slipping clutches it will wear out them quite quickly.
I was thinking I will run my box to the ground and then do a manual conversion when it fails but having second thoughts now. I am thinking of oil change but I would also take it apart and clean it at the same time. Is anybody interested in buying 20l can of oil and split it in half with me(should be around £160 for 20l)? There is 9-9.5 liters of oil in gearbox but if you do not take it off it will only drain 6-7l as some oil is left in torque converter and cooler or if you do a flush then it will take 11-12l.
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