The best answer for this question is GL-4 fluid period, not GL-4, GL-5 compatable, you want GL-4 only. As far as I know Redline MT-90, Sta-Lube and maybe one other manufacturer makes GL-4 tranny fluid.
Do not use GL5 transmission fluid. It will damage the synchros in the Nissan transmission. You need GL4 fluid. Most fluid you buy at autoparts stores is GL5 and of story.
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