2011 Subaru Outback Owner's Manual - Page 448

& Fuel: GAS STATION REFERENCE & Fuel capacity: 18.5 US gal (70 liters, 15.4 Imp gal) ! 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. & 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 & 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. & 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)