Honda SILVER WING FSC600D 2007 Owner's Manual page 128

Decreasing the concentration of antifreeze
to less than 40% will not provide proper
corrosion protection.
Increasing the concentration of antifreeze
is not recommended because it decreases
cooling system performance. Higher
concentrations of antifreeze (up to 60%)
should only be used to provide additional
protection against freezing. Check the
cooling system frequently during freezing
weather.
Checking & Adding Coolant
Refer to Saf ety Precautions
RIGHT FRONT
(1)
(2)
(1) UPPER level mark
(2) LOWER level mark
Servicing Your Honda
Coolant
on page 82 .
119