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:
Important ventilating information
If the engine is idling while the vehicle is stopped for a long period of
time, open the windows at least 1 inch (2.5 cm) or adjust the heating or
air conditioning to bring in fresh air. ...
MKZ Engines, Transmissions and Drive Systems
The 2013 Lincoln MKZ offers three distinct powertrains. The standard
2.0-liter four-cylinder EcoBoost® delivers the performance of a traditional V6
along with expected segment-leading fuel economy ...
Anti-scan feature
If the wrong code has been entered seven times (35 consecutive button
presses), the keypad will go into an anti-scan mode. This mode disables
the keypad for one minute and the keypad lamp will fla ...