GMC Terrain: Recommended Fuel - Fuel - Driving and Operating - GMC Terrain Owner's ManualGMC Terrain: Recommended Fuel

Use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, an audible knocking noise, commonly referred to as spark knock, might be heard when driving. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. If heavy knocking is heard when using gasoline rated at 87 octane or higher, the engine needs service.

    Fuel
    Use of the recommended fuel is an important part of the proper maintenance of this vehicle. To help keep the engine clean and maintain optimum vehicle performance, we recommend the use of gasoline ...

    Gasoline Specifications (U.S. and Canada Only)
    At a minimum, gasoline should meet ASTM specification D 4814 in the United States or CAN/CGSB&-3.5 or 3.511 in Canada. Some gasolines contain an octane-enhancing additive called methylcyclopen ...

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    Comfort
    Comfort mode offers a somewhat softer ride and the transmission shifts gears at lower rpm. This mode is particularly suitable for long-distance highway driving. The indicator light in the butto ...

    Manual Lumbar Support — If Equipped
    For models equipped with manual lumbar the support lever is located on the inboard side of the seat. Turn the lever downward to increase and upward to decrease the desired amount of lumbar suppo ...

    Moonroof – if the moonroof cannot be closed
    If the moonroof cannot be closed with the moonroof switch, you can close the moonroof manually. 1. Remove the plug on the roof trim of the cargo area by inserting the end of the flathead sc ...