Honda CRF230F Owner's Manual page 71

ENGINE OIL
Refer to the Safety Precautions on page 47.
Engine Oil
Good engine oil has many desirable qualities.
Use only high detergent, quality motor oil
certified on the container to meet or exceed
requirements for API Service Classification
SE, SF or SG.
Viscosity:
Viscosity grade of engine oil should be based
on average atmospheric temperature in your
riding area. The following provides a guide to
the selection of the proper grade or viscosity
of oil to be used at various atmospheric
temperatures.
60
1 0 W
(1)
(2)
-10 0
20 40
(1) Single grade
2 0 W
20
30
40
20W 40 20W 50
15W 40 15W 50
10W 40
10W 30
10 20 30 40°C
60 80 100°F
(2) Multi grade