Subaru 2001 Outback Owner's Manual page 448

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Fuel:
! Non-turbo models
Use only unleaded gasoline with an octane rating of 87 AKI or
higher.
! Turbo models
Use premium unleaded gasoline with an octane rating of 93
AKI or higher. For temporary purposes if premium unleaded
gasoline is not available, you may use regular unleaded
gasoline with an octane rating of 87 AKI or higher. For optimum
engine performance and driveability, it is required that you use
premium grade unleaded gasoline.
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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" F7-2 section in this manual.
GAS STATION REFERENCE
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Fuel capacity:
18.5 US gal (70 liters, 15.4 Imp gal)
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Engine oil:
Use only API classification SM with the words "ENERGY
CONSERVING" or ILSAC GF-4, which can be identified with
the ILSAC certification mark (Starburst mark).
For the complete viscosity requirements, refer to the following
sections.
. "Recommended grade and viscosity" F11-16
. "Recommended grade and viscosity under severe driving
conditions" F11-17
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Engine oil capacity:
2.5 L models: 4.2 US qt (4.0 liters, 3.5 Imp qt)
3.6 L models: 6.7 US qt (6.3 liters, 5.5 Imp qt)