I will buy 5 quarts of Mobil 1 gear oil. It has been extremely cold in Atlanta for the last week. I have been very happy with synthetic oil in the engine. I hope that I will get better, smoother shifts with synthetic in the transmission.
I lost a lot of fluid when I changed my cv boot. I threw in another quart of Valvoline 80-90 synthetic. The shifting gates seem more prominent now...I like it. Less mushy.
My bro had some 130-160 heavy duty fluid in his 93 Maxima...that stuff's awesome! It's so thick that the tranny's really quiet and smooth. Shifting felt very positive and not floaty. I loved it. I might use some heavy duty stuff when I get my stock flywheel lightened and get the ACT clutch.