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:
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Attaching tether straps
Many forward-facing child safety seats include a tether strap which
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Interior
Like the bigger MKS, the MKZ comes with genuine wood trim and upscale
leather. The optional navigation system features Sirius Travel Link, which can
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