Oils

What oils do you recommend to use? i use the yamalube in both the diffs and engine but they seem to be pricey.didnt know if there was any better oils out there to use.also the bike is a 450 which has the wet brake in the rear diff so it has to be compatible with that and it’s cold here in the winters.im not sure if that has to do with anything while choosing oils.any suggestions? Thanks

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