Subaru 2013 Legacy, 2013 Outback Owner's Manual page 510

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Fuel:
Use only unleaded gasoline with an octane rating of 87 AKI
(90 RON) or higher.
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Fuel octane rating
This octane rating is the average of the Research Octane and
Motor Octane numbers and is commonly referred to as the Anti
Knock Index (AKI). Refer to "Fuel" F7-3.
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Fuel capacity:
18.5 US gal (70 liters, 15.4 Imp gal)
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Engine oil:
Use only the following oils.
. API classification SM or SN with the words "ENERGY
CONSERVING" or "RESOURCE CONSERVING"
. or ILSAC GF-4 or GF-5, which can be identified with the
ILSAC certification mark (Starburst mark)
For the complete viscosity requirements, refer to "Engine oil"
F12-4.
GAS STATION REFERENCE
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2.5 L models: 5.1 US qt (4.8 liters, 4.2 Imp qt)
3.6 L models: 6.9 US qt (6.5 liters, 5.7 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" F11-11.
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Refer to "Tires" F12-9.
Engine oil capacity:
Cold tire pressure: