I am using Red Line MT-90 synthetic manual transmission lubricant. It is a 75W-90 gear oil rated API GL-4. It has worked well both hot and cold in my Xterra. This product is not particularly cheap nor easy to find locally, but it seems to be one of the few compatible gear oils for the X. :rolleyes:
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2001 XE 4x4 3-pack 5-spd