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Thanks to Polishzx, ZUL8TR, and slayer fan. Redline 75W-90, Mobil 1 75W-90, and Amsoil Severe Gear 75W-90 all contain friction modifiers, so I think it's safe to say the consensus is that yes, the diff oil for a stock diff should include friction modifiers. Other folks are still welcome to weight in if they have additional info, e.g. the composition of the OEM Nissan fluid.
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