Octane recommendations

“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 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:
2011 Lincoln MKX brimming with standard and class-exclusive technologies
Standard MyLincoln Touch and remote start lead the list of features or
technologies that are new for the 2011 Lincoln MKX, including:
Adaptive Cruise Control and Collision Warning with Brake Suppo ...
Ordering additional owner’s literature
To order the publications in this portfolio, contact Helm, Incorporated at:
HELM, INCORPORATED
P.O. Box 07150
Detroit, Michigan 48207
Or to order a free publication catalog, call toll free: 1 ...
Vehicle storage
If you plan on storing your vehicle for an extended period of time
(30 days or more), refer to the following maintenance recommendations
to ensure your vehicle stays in good operating condition.
...
