Subaru 2011 Tribeca Owner's Manual page 418

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Fuel
Use unleaded gasoline with an octane rating of 87 AKI 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 octane rating" F7-2.
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Fuel capacity
16.9 US gal (64 liters, 14.1 Imp gal)
GAS STATION REFERENCE
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Use only the following oils.
. ILSAC GF-4 or GF-5, which can be identified with the ILSAC
certification mark (Starburst mark)
. or API classification SN or SM with the words "ENERGY
CONSERVING"
For the complete viscosity requirements, refer to the following
sections.
. "Recommended grade and viscosity" F11-9
. "Recommended grade and viscosity under severe driving
conditions" F11-10
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6.7 US qt (6.3 liters, 5.5 Imp qt)
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Refer to "Tires" F12-4.
Engine oil
Engine oil capacity
Cold tire pressure