Having had both MT-90 and mostly Amsoil MTG in my maxima 5 speed transmission, I can say that in sub freezing temps, as the RL warmed up, it went through a transition where it was impossible to select any gears without grinding them. It would start smooth as a baby's bottom, go through this notchy spot and then at operating temps, settle somewhere in between (as somebody said before, no miracle but still better than the OEM fluid). Also, MT-90 eventually dried up the cheapo Nissan seals and started a slow leak. I solved both issues by replacing the fluid with a ~4:1 blend of Amsoil MTG and Sta-Lube 80W90 dino. The home made blend revived the seal in six months and the shifts are better than with MT-90, no matter the ambient temp.