Subaru Forester: Turbo models - Fuel requirements - Fuel - Starting and operating - Subaru Forester Owner's ManualSubaru Forester: Turbo models

The engine is designed to operate using premium unleaded gasoline with an octane rating of 91 AKI (95 RON) or higher. If premium unleaded gasoline is not available, regular unleaded gasoline with an octane rating of 87 AKI (90 RON) or higher may be temporarily used. For optimum engine performance and driveability, it is required that you use premium grade unleaded gasoline.

NOTE
Be sure to use premium unleaded gasoline of 91 AKI (95 RON) or higher for turbo engine models. If other gasoline (lower than 91 AKI (95 RON)) is used, knocking, reduced output and poor accelerator response will result.

    Non-turbo models
    The engine is designed to operate using 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). Using a gasoline with a lower octane rating can ca ...

    See also:

    Low battery voltage
    If the battery voltage is too low, the parking brake cannot be applied or released. Connect an auxiliary battery if the battery voltage is too low, see page 114. ...

    Cleaning Plastic Instrument Cluster Lenses
    The lenses in front of the instruments in this vehicle are molded in clear plastic. When cleaning the lenses, care must be taken to avoid scratching the plastic. 1. Clean with a wet soft rag.Amil ...

    Measurement of weights
    Secure loose items to prevent weight shifts that could affect the balance of your vehicle. When the vehicle is loaded, drive to a scale and weigh the front and the rear wheels separately to de ...