Honda CB TWISTER Owner's Manual page 54

ENGINE OIL
Refer to the Safety Precautions on page 40.
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 SJ.
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.
46
Recommended Oil
1. 20W-40 2 10W-30MA
ENGINE OIL
Engine oil quality is the chief factor affecting
engine service life. Change the engine oil
as specified in the maintenance schedule
(Ref. page 42).
When running in very dusty conditions, oil
changes should be performed more
frequently than specified in the maintenance
schedule.