Honda FSC600D/A 2005 SILVER WING Owner's Manual page 119

Engine Oil, Filter & Strainer Screen
Your scooter does not need oil additives.
Use the recommended oil.
Do not use API SH or higher oils
displaying a circular API ''energy
conserving'' service label on the
container. They may affect lubrication
and clutch performance.
NOT RECOMMENDED
Do not use non-detergent, vegetable, or
castor based racing oils.
110
Servicing Your Honda
Other viscosities shown in the following
chart may be used when the average
temperature in your riding area is within
the indicated range.
OK