Mobile 1 Syn 5W-30 year-round
Valvoline Syn 75w-90
I do however run Motul in my G Coupe's trans and it def made things smoother. The Z/G '03-'04 trans can be a little rough around the edges shifting into 3rd esp.
I'll probably use Motul or Redline in the B13 trans when I next change it, but no reason to go away from M1 for the motor.
The PureOne is a pretty good filter, I looked into a lot of filters because I have B13, U13, V35 and wanted to order up some bulk, seems like I'm always changing oil. Construction and filtration very good in the PureOne filter. Surprisingly so was the NAPA Gold Filter (forget the actual manufacturer, they sell their own under their name for more $$$). I'm death on FRAM oil filters, for many reasons based on my own experience and how they test out in labs.