Subaru Impreza 2.2L MT Owner's Manual page 272

2. Loosen the radiator cap to drain the coolant from the radiator. Then
drain the coolant from the reserve tank. Tighten the drain plug securely.
3. Slowly pour the coolant and fill to the radiator filler neck and to the
reserve tank's "FULL" level mark. Do not pour the coolant too quickly, as
this may lead to insufficient air bleeding and trapped air in the system.
Coolant capacity: 6.2 US qt (5.8 liters, 5.2 Imp qt)
10-16
HGA000BB
Filler neck
Fill up to here
OM-H0197
"FULL"
level mark
"LOW"
level mark
HG0114