Look at the specs on the Castrol site it's a mono grade sae 95 oil so depends where u r in the world.
 
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Should be ok for axles & transfer box, but NOT gearbox. R380 g-box runs on ATF. (Yes, a manual box that runs on DexronII or DexronIII auto fluid)
 
Just been on the Castrol site and can`t find SP320 approved for any road/truck uses?? If it`s an sae95 gear oil I`d say it`s slightly heavier than the recommended, but....
Looked again and seems to be for industrial gearboxes. Maybe ok, but no guarantees. If you`ve got freebie then maybe use it??
 

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