Subaru 2015 XV Crosstrek Hybrid Owner's Manual page 570

Fuel:
Use only unleaded gasoline with an octane rating of 87 AKI
(90 RON) or higher.
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
Fuel capacity:
13.7 US gal (52 liters, 11.4 Imp gal)
GAS STATION REFERENCE
Engine oil:
Use only the following oils.
. API classification SM with the words ENERGY CONSER-
VING or SN with the words 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
7-2.
12-5.
Engine oil capacity:
5.1 US qt (4.8 liters, 4.2 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 the oil level gauge. For more details about
maintenance and service, refer to Engine oil
Cold tire pressure:
Refer to Tires 12-9.
11-10.