Just Replaced Manual Transmission Fluid on my 2016 Versa S @ 76,500 miles.
Used Red Line MT-85 75W85 GL-4 Manual Transaxle Lubricant. Took slightly less than 3 Quarts. It is a full synthetic.
Replaced both plugs and both washers.
Old Fuid still looked pretty good.
I'll update with performance difference in the future.