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:
On-board diagnostics (OBD-II)
Your vehicle is equipped with a computer that monitors the engine’s
emission control system. This system is commonly known as the
on-board diagnostics system (OBD-II). The OBD-II system protects t ...
SAFETY
There's no hunting or digging for Latch connectors in the MKZ. They stuck out
from the cushions, so there wasn't any thumb-wrestling with overstuffed cushions
to get everyone's child-safety seats ...
Child safety locks
When these locks are set, the rear
doors cannot be opened from the
inside.
The rear doors can be opened from
the outside when the childproof
door locks are set, but the doors are
unlock ...
