I use redline MT90 in my ae111 and still do in my zze123, and im realy impressed with it especially if you drive very hard or do solodex. I used to have shifting problems when i used the stock stuff in extreme driving conditions, but with the redline it actually gets better with heat.

MT90 is 75w90.
REDLINE MT-90
Popular in Nissan, Toyota and Mazda manual transmissions and transaxles as well as other selected applications, this is a 75W90 GL-4 Gear Oil that’s slightly heavier than MTL. Provides excellent protection of gears and synchronizers and its balanced slipperiness provides a perfect coefficient of friction, allowing easier shifting.