Offroad-Express

Hey guys my mate has an Isuzu 89 bighorn irmsher engine rlf he was told that they made need thicker oil for the diff can anyone recommend wwhich oil to use.
cheers guys.

Is it open or lsd? What sort of ouil is he currently running? What is the problem that the advice of thicker oil was gievn for?

Its lsd i don't think there is any problem with it the dude just said some of them need thicker oil i told him just to use lsd oil.