Subaru 2003 Impreza Owner's Manual page 351

Maintenance and service
1) Yellow handle
11-28
A) HOT range
B) COLD range
4. Pull out the dipstick and check the fluid level on
the gauge. If it is below the lower level on the "HOT"
range, add the recommended automatic transmis-
sion fluid up to the upper level.
B Checking the fluid level when the fluid is cold
When the fluid level has to be checked without time
to warm up the automatic transmission, check to
see that the fluid level is between the lower level
and upper level on the "COLD" range. If it is below
that range, add fluid up to the upper level. Be care-
ful not to overfill.
1) Upper level
2) Lower level