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:
MyKey restricted features
Standard settings – these settings cannot be changed
• Belt-Minder cannot be disabled. The audio system will be muted
whenever Belt-Minder is activated until the safety belts are buckled.
Refer ...
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.
...
Toothy Grille
The MKZ's styling is starting to grow on me. The front end is distinctive. It
gets a new tooth-like grille for 2010, which bears a closer resemblance to
models like Lincoln's MKS full-size sedan a ...
