EP90 in the transfer box .
Landrover official recommend MTF94 for the R380.
Previously LR recommended ATF for the R380 before they wised up.
You could use either,but I recommend Landrover MTF94. It's not to expensive from themain dealer, gives smooth gearchange and reduced noise over the ATF I previously used.
No doubt someone will come along and also say Difflock's Evolution oils for the R380 of which I have no experience of but heard good things.....though I have had experience of shopping with difflock and it's not something I am ever going to repeat again or recommend to anyone.