I used Castrol LS90 in both diffs (rear diff needs LS90 while front diff can use any gear oil, so many people will use the same oil in both diffs).Gearbox oil choice depends on climate. In a cold climate, you can't go past the Castrol VMX-M (75/85) as mentioned above because the H150F gearbox baulks at cold shifts with thicker gearoils. If you spend all your time in the tropics, then other factory spec (75/90) oils are OK.