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:
Lifestyle
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•Roof racks and carriers*
•Cargo net
•Navigation*
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Second-row non-adjustable head restraints
Your vehicle is equipped with second row outboard head restraints that
are non-adjustable.
WARNING: To minimize the risk of neck injury in the event of a
crash, the driver and passenger occupants ...
Fun tuned in while noise is tuned out
A wealth of upgrades means the 2011 Lincoln MKX will provide a more connected
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