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:

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