Subaru 2009 Impreza - Manual (Page 340)

WRX STI
1)
Thermo switch
2) Drain hole
3) Oil level
Remove the thermo switch from the filler
hole and check the oil level. The oil level
should be kept even with the bottom of the
filler hole. If the oil level is below the
bottom edge of the hole, add oil through
the filler hole to raise the level.
CAUTION
. Be careful not to spill rear differ-
ential gear oil when adding it. If
rear differential gear oil touches
the exhaust pipe, it may cause a
bad smell, smoke, and/or a fire. If
rear differential gear oil gets on
the exhaust pipe, be sure to wipe
it off.
. If the vehicle requires frequent
refilling, there may be an oil leak.
If you suspect a problem, have
the vehicle checked at your
SUBARU dealer.
& Recommended grade and
viscosity
Each oil manufacturer has its own base
oils and additives. Never use different
brands together.
Oil grade:
API classification GL-5
SAE viscosity No. and applicable tempera-
ture
Maintenance and service
11-25