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I've acquired a new-to-me good-condition stock N/A VLSD diff, and I'm having trouble figuring out what diff oil(s) to put in it. Notably, I'm aware the stock diff calls for 75w-90 GL-5 fluid, but can't seem to find a resource that explicitly explains if it calls for fluid with friction modifiers in it or not. Basically, the question is whether I should run Redline 75W-90 Gear Oil (that comes with friction modifiers in it), Redline 75W-90 NS Gear Oil, (that comes without friction modifiers), or some other fluid. So, should the stock diff fluid have friction modifiers or not, and is Redline or some other brand the best available?
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