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:
Low fluid level
Do not drive the vehicle if the fluid
level does not show at all on the
dipstick.
Driving the vehicle with less than
the recommended fluid level may result in transmission failure. An under
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Special Operating Condition Log
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First generation (1998–2002)
The 1998 Navigator introduced the concept of the American luxury SUV,
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leather, wood, and fine carpeting, but its humble ...