Subaru WRX-STI Owner's Manual page 578

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Fuel:
! STI
Use only unleaded petrol with 98 Octane or higher.
This octane rating is the Research Octane number.
! Except STI
Use only unleaded petrol with 95 Octane or higher.
This octane rating is the Research Octane number.
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Fuel capacity:
60 liters (15.9 US gal, 13.2 Imp gal)
GAS STATION REFERENCE
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Use only the following oils.
. API classification SN with the words "RESOURCE CON-
SERVING"
. or ILSAC GF-5, which can be identified with the ILSAC
certification mark (Starburst mark)
. or ACEA specification A3 or A5
For the complete viscosity requirements, refer to "Engine oil"
F12-4.
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! STI
4.3 liters (4.5 US qt, 3.8 Imp qt)
! Except STI
5.1 liters (5.4 US qt, 4.5 Imp qt)
The indicated oil quantity is only a guideline and is estimated
based on a case when the engine oil is changed with an oil
filter. After refilling the engine with oil, the oil level should be
checked using an oil level gauge. For more details about
maintenance and service, refer to "Engine oil" F11-16.
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See the label located under the driver's door latch.
Engine oil:
Engine oil capacity:
Cold tire pressure: