Honda 2006 CB600F Owner's Manual page 123

Coolant
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.
114
Servicing Your Honda
Checking & Adding Coolant
Refer to Saf ety Precautions
LEFT SIDE
(3)
(1) UPPER level mark
(2) LOWER level mark
(3) reserve tank cap
on page 82 .
(1)
(2)