I read this topic on my350z.com here
http://my350z.com/forum/engine-and-driv ... -info.html
Very informative, backed up by lab analysis of the used oils indicating which oil used, miles done and standard or modified engines.
Lots of good oils to choose from.
CAUTION over 900 pages
Mobil 1 0w40 did quite well.
Surprisingly Mobil 1 5w30 didn't despit 5w30 being our recommended viscosity.
Apparently the 5w30 is a totally different blend