2004 Subaru Forester Owner's Manual - Page 439

GAS STATION REFERENCE Fuel: 2.5 Liter models Use only unleaded gasoline with an octane rating of 87 AKI or higher. 2.5 Liter (Turbo) models Use premium unleaded gasoline with an octane rating of 91 AKI or higher. If premium unleaded gasoline is not available, regular unleaded gasoline with octane rating of 87 AKI or higher may be temporarily used. For optimum engine performance and driveability, it is recommended that you use premium grade unleaded gasoline. (AKI). Refer to "Fuel" section in this manual. Fuel capacity: 15.9 US gal (60 liters, 13.2 Imp gal) Engine oil: Use only API classification SL with the words "ENERGY CONSERVING" and the New API certification mark (starburst mark) displayed on the container (ILSAC GF-3). Engine oil capacity: 4.2 US qt (4.0 liters, 3.5 Imp qt) Fuel octane rating This octane rating is the average of the Research Octane and Motor numbers and is commonly referred to as the Anti Knock Index Cold tire pressure: See the label located under the driver's door latch.