Octane recommendations

Octane recommendations  - What you should know about automotive fuels - Maintenance and Specifications - Lincoln MKX Owners Manual - Lincoln MKX

“Regular” unleaded gasoline with a pump (R+M)/2 octane rating of 87 is recommended. Some stations offer fuels posted as “Regular” with an octane rating below 87, particularly in high altitude areas. Fuels with octane levels below 87 are not recommended.

Do not be concerned if your engine sometimes knocks lightly. However, if

Do not be concerned if your engine sometimes knocks lightly. However, if it knocks heavily under most driving conditions while you are using fuel with the recommended octane rating, see your authorized dealer to prevent any engine damage.

    See also:

    CTA and Reverse Sensing System (RSS) interaction
    CTA works along with the Reverse Sensing System (RSS) (if equipped). Become familiar with the warning tones of both systems. ...

    Underbody
    Flush the complete underside of your vehicle frequently. Keep body and door drain holes free from packed dirt. ...

    Automatic arming
    The vehicle is armed immediately after switching the ignition to the off position. The theft indicator will flash every two seconds to act as a theft deterrent when the vehicle is armed. ...