It depends the motor.
it is origanal oil
Mobil 1 synthetic.
Full Synthetic 5w-30
2 cycle motor oil
5w-30 full synthetic
The kind of oil that you should use for the Honda CR 250 is Honda HP2 mixed at 32:1. You do not want to use regular motor oil in your bike.
The motor is a Honda G300.
If it is a 2 cycle where you mix the oil with the gasoline then use 2 cycle marine oil. If it is a 4 cycle then use the weight recommended by Evinrude.
Use SAE 10W30 type SE motor oil, 0.8 Liter, according to the service manuel.
Mobil 1 V-twin
0-40w mobil 1 synthetic European formula
quaker state motor oil