Engine Oil Additives/Engine Oil Flushes

GMC Sierra / GMC Sierra Owners Manuals / Vehicle Care / Vehicle Checks / Engine Oil / Engine Oil Additives/Engine Oil Flushes

Do not add anything to the oil. The recommended oils with the dexos specification and displaying the dexos certification mark are all that is needed for good performance and engine protection.

Engine oil system flushes are not recommended and could cause engine damage not covered by the vehicle warranty.

    See also:

    Disarming the System
    To disarm the system, do one of the following: ○ Press on the RKE transmitter. ○ Turn the ignition to ON/RUN. ○ Allow the alarm to time out after about 30 seconds and reset itsel ...

    Engine Oil Additives/Engine Oil Flushes
    Do not add anything to the oil. The recommended oils with the dexos specification and displaying the dexos certification mark are all that is needed for good performance and engine protection. En ...

    Using Voice Commands During a Planned Route
    Cancel Route 1. Push . System responds: “OnStar ready,” then a tone. Say “Cancel route.” System responds: “Would you like to cancel route directions to your destination?” 2. Say “Yes. ...