The heaviest oil you want in the centre then next heaviest in the front, lightest in the back...if the oil in the centre is too light too much power will transfer to the front (way too much ballooning and a sort of FWD effect) , and the same principle goes for the front diff...too light and the inside tire will get transfered too much power...go at least 20-30 centre IMO...say 5 - 20 - 10 or 10 - 30 - 20 something like that...
