0M1 Diff Gear Oil

Does everyone use the recommended 75W90 GL4 or has anyone tried 75W140?

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I do not think you'd be "helping" anything by going to a heavier fluid. Even the 01P transmission in the Transporters use the same G-052-145-S2 diff oil which is the lighter weight. And it is not exactly like the differential is the weak link in the 01M's chain anyway.