Amsoil synthetic 10 - 30 weight will work and your engine will run cooler.
93 octane or above no ethanol or add Ethanol Fuel Conditioner (Lucas Oil).. You can get race gas (100 - 105) in some areas or your local rural airport you can get AVGAS 100/130
Amsoil is damned good oil.
It and most other synthetics are made from natural gas.
A more recent development out of Pasgacula is “synthetic” lube made from residual oil. I’ll reserve judgement on this product...