A place for more technical discussions. Please make sure you post in the correct section on the site, this way it keeps the site tidy AND ensures you get a more relevant answer.
API GL-4 SAE 75w-90 for gearbox and transfer box.
API GL-5 hypoid, SAE 80w-90 for the diffs.
Capacities, gearbox 1.3lts and transfer 1.13lts, so about 2.5lts total.
Diffs, front 1.65ltr and rear is 1.35ltr, so 3lts total.
It's a bit of a pain having to get two sorts, but the diffs do need the hypoid, and it would probably cause the gearshift quality to drop, if you put hypoid in the gearboxes. Plus, the extra drag, can affect fuel consumption a bit.
Lots of different oils fall within those specs, which is probably why you are getting confused with 'contradicting' answers. Any of them will be fine.
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