37 EFI oil question

So I know it’s recommended to not use full synthetic oil until 100 hrs, what should I use for my 37 EFI? Currently I’m running 10w40 Kawasaki part synthetic, would I be ok to use the Kawasaki 20w50 blend part syn? And then at 100 hrs go to the Vanguard oil full syn 15w50/20w50, Or should I just switch to Vanguard oil full syn now?

Thank you