GMC 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 ...See also:
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 ...