I'd stick with a name brand full synthetic 5W30 until out of warranty for sure.
My preferences - PU5W30 then M1 0W40 once you run out the warranty.
I currently run either T6 5W40, M1 TDT 5W40, or M1 0W40 in my LS2 ... of course I am modified, high mileage, and way past warranty.
Opinions vary...