Changing The Oil And Oil Filter; Recommended Grade And Viscosity; Synthetic Oil - Subaru WRX-STI Owner's Manual

11-18
Maintenance and service/Engine oil
CAUTION
For models except STI, be careful
not to touch the engine oil filter
when removing the oil filler cap.
Doing so may result in a burn, a
pinched finger, or may cause some
other injury.
To add engine oil, remove the engine oil
filler cap and slowly pour engine oil
through the filler neck. After pouring oil
into the engine, you must use the level
gauge to confirm that the oil level is
correct.
For STI, just after driving or while the
engine is warm, the engine oil level
reading may be in a range between the
upper level and the notch mark. This is
caused by thermal expansion of the
engine oil.
NOTE
To prevent overfilling the engine oil, do
not add any additional oil above the full
level when the engine is cold.
& Changing the oil and oil filter
Change the oil and oil filter according to
the maintenance schedule.
The engine oil and oil filter must be
changed more frequently than listed in
the maintenance schedule, when short
trips are frequently made, when towing a
trailer, or when driving in extremely cold
weather.
NOTE
. Changing the engine oil and oil filter
should be performed by a well-trained
expert. We recommend that you con-
tact your SUBARU dealer for changing
the engine oil and oil filter. Fully trained
mechanics are on standby at a
SUBARU dealer to utilize the special
tools, spare parts and recommended
oil for this work, and also, used oils are
properly disposed of.
. If performing oil replacement your-
self, observe the local regulations and
dispose of waste oil properly.
& Recommended grade and
viscosity
CAUTION
Use only engine oil with the recom-
mended grade and viscosity.
Refer to Engine oil F12-4.
NOTE
Engine oil viscosity (thickness) affects
fuel economy. Oils of lower viscosity
provide better fuel economy. However,
in hot weather, oil of higher viscosity is
required to properly lubricate the en-
gine.
& Synthetic oil
You can use synthetic engine oil that
meets the same requirements given for
conventional engine oil. When using
synthetic oil, you must use oil of the same
classification, viscosity and grade shown
in this Owner s Manual.
Refer to Engine oil F12-4. Also, you
must follow the oil and filter changing
intervals shown in the maintenance sche-
dule. Refer to Maintenance schedule
F11-3.
NOTE
Synthetic oil of the grade and viscosity
noted in chapter 12 is the recom-
mended engine oil for optimum engine
performance. Conventional oil may be
used with no detriment to engine dur-
ability or driveability.