Subaru 2009 Impreza - Manual (Page 339)

11-24
Maintenance and service
& 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
Rear differential gear oil
& Checking the gear oil level
Except WRX STI
1)
Filler hole
2) Drain hole
3) Oil level
Remove the plug 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.