It depends the motor.
Aviation fuel
Most use Synthetic Oil.
you do not use gas for an airplane you would use a cemical/ assid
Full Synthetic 5w-30
Mobil 1 synthetic.
it is origanal oil
5w-30 full synthetic
That is allowed.
You can use 10w 30...But the guy at the auto shop said that you SHOULD use 5w 30.
0-40w mobil 1 synthetic European formula
Mobil 1 V-twin