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.

    See also:

    Keys
    WARNING Leaving children in a vehicle with the ignition key is dangerous for many reasons. Children or others could be badly injured or even killed. They could operate the power windows or other cont ...

    Under the Hood
    The Yukon is available with either rear- or four-wheel drive. The Yukon Denali can have an all-wheel-drive system that's distinct from the available part-time four-wheel drive on the regular Yukon ...

    Rear Seats
    The vehicle's rear seat has head restraints in the outboard seating positions that cannot be adjusted. Rear outboard head restraints are not designed to be removed. ...