After looking in The WS Man(Can be Confusing to make sure you are getting the right spec for the Right Model) and Chatting to Nissan and a Couple of Mechanics this seems to be the consensus:
Lubricants for a Y61 4500 GRX
Engine: 10w40
Gearbox: 75w90 GL4
Front Diff: 75w90 GL5
Rear Diff: LS Diff Oil
Transfer Box: ATF
I am thinking of Going With Liqui Moly on all the replacement oils, has anyone used this and what were your experiences?
What do you Guys Rekon?

Your input will be much apreciated.