Oil & Fuel Gearbox and hydraulic oil for a david brown 1390

[vasco]

Hello all you good people,

I'm a new member on this community and a recent tractor owner. Just bought a '81 1390 David Brown and I'm planning to do all oil and filter changes. Can anyone tell me what kind of oil should I put in the gearbox? How many oil would it take to fill it up?
Thank you all !!!
Vasco