owners manual Subaru Forester

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7-2 Starting and operating Fuel Starting and operatingreduced output and poor accelerator meets the clean burning low-sulfur Califor- response will result. nia gasoline specifications. If you live in Fuel octane rating any other state than California, your vehi- This octane rating is the average of the cle will operate on gasoline meeting Fed- Use of a fuel which is low in quality Research Octane and Motor Octane num- eral specifications. Gasoline sold outside or use of an inappropriate fuel addi- bers and is commonly referred to as the California is permitted to have higher sul- tive may cause engine damage. Anti Knock Index (AKI). fur levels, which may affect the perfor- Using a gasoline with a lower octane rat- mance of your vehicle’s catalytic convert- Fuel requirements ing can cause persistent and heavy er and may produce a sulfur exhaust odor knocking, which can damage the engine. or smell. SUBARU recommends that you Non-turbo models Do not be concerned if your vehicle some- try a different brand of unleaded gasoline The 2.5-liter non-turbo engine is designed times knocks lightly when you drive up a having lower sulfur to determine if the to operate using unleaded gasoline with hill or when you accelerate. See your problem is fuel related before returning an octane rating of 87 AKI or higher. dealer or a qualified service technician if your vehicle to an authorized dealer for you use a fuel with the specified octane service. Turbo models rating and your vehicle knocks heavily or MMT The 2.5-liter turbo engine is designed to persistently. Some gasoline contains an octane-en- operate using premium unleaded gasoline Unleaded gasoline hancing additive called MMT (Methylcy- with an octane rating of 91 AKI or higher. clopentadienyl Manganese Tricarbonyl). If If premium unleaded gasoline is not avail- The neck of the fuel filler pipe is designed you use such fuels, your emission control able, regular unleaded gasoline with an to accept only an unleaded gasoline filler system performance may deteriorate and octane rating of 87 AKI or higher may be nozzle. Under no circumstances should the CHECK ENGINE warning light/Mal- temporarily used. For optimum engine leaded gasoline be used because it will function indicator lamp may turn on. If this performance and driveability, it is required damage the emission control system and happens, return to your authorized that you use premium grade unleaded may impair driveability and fuel economy. SUBARU Dealer for service. If it is deter- gasoline. Gasoline for California-certified LEV mined that the condition is caused by the NOTE Your vehicle was certified to California’s type of fuel used, repairs may not be cov- Be sure to use premium unleaded gas- low emission vehicle (LEV) standards as ered by your warranty. oline of 91 AKI or higher for a 2.5-liter indicated on the underhood tune-up label, turbo engine model. If other gasoline it is designed to optimize engine and (lower than 91 AKI) is used, knocking, emission performance with gasoline that

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