You must check this
ATTENTION: ALL Nismo 370Z Owners: Please check your suspension!
As intakes i recommend you the stillen
Your car got an oil cooler but small if you gonna track it get an upgrade
For your oil questions
Motul 300v 75w90 2qt (trans)
Motul 300v 75w90 1-2qt (LSD)
Motul 300v 5-30 5-6qt (engine)