Subaru Forester 2013 Owner's Manual page 447

Check the coolant level at each fuel stop.
1. Check the coolant level on the outside
of the reservoir while the engine is cool.
2. If the level is close to or lower than the
"LOW" level mark, add coolant up to the
"FULL" level mark. If the reserve tank is
empty, remove the radiator cap and refill
coolant up to just below the filler neck as
shown in the following illustration.
1) Fill up to this level
3. After refilling the reserve tank and the
radiator, reinstall the cap and check that
the rubber gaskets inside the radiator cap
are in the proper position.
CAUTION
. Be careful not to spill engine
coolant when adding it. If coolant
touches the exhaust pipe, it may
cause a bad smell, smoke, and/or
a fire. If engine coolant gets on
the exhaust pipe, be sure to wipe
it off.
. Do not splash the engine coolant
over painted parts. The alcohol
contained in the engine coolant
may damage the paint surface.
Maintenance and service/Cooling system
! Changing the coolant
It may be difficult to change the coolant.
We recommend that you have the coolant
changed by your SUBARU dealer if
necessary.
The coolant should be changed according
to the maintenance schedule in the
"Maintenance schedule" F11-3.
11-21