I use Castrol EPX80/90 in my diffs,transfer and swivels with no problems yet.
I tend to fill the rear up a little more as the bearings are oil lubed.
As for the R380 I use CASTROL SYNTRANS 75W/85.
Have a look here select make,model and year (read the notes at he bottom).
Castrol Australia - NetLube


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) group more definitive information, kind of like a database. 

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