what oil to use

"Don't care".

I use Amsoil in everything I own, in whatever grade it needs. So far I have had no problems. I live near a regional warehouse and have access to people who have worked for them for 20+ years with lots of personal experience.

If it's good enough for the manager to run in his personal Lola chassis SCCA car (185+ mph go kart :-D ) I think it'll work just fine in my 360.