1997 Mercury Mystique Owner Guide 1st Printing - Page 208
1997 Mercury Mystique Manual
Page 208 highlights
Maintenance and Care Octane recommendation Your vehicle is designed to use regular gasoline with an (R+M)/2 octane rating of 87. We do not recommend gasolines labeled as "regular" in high altitude areas that are sold with octane ratings of 86 or even less. Typical octane rating label Do not be concerned if your vehicle sometimes knocks lightly. However, if it knocks heavily under most driving conditions on the recommended octane fuel, see your dealer or a qualified service technician to prevent any engine damage. 209
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Maintenance and Care
209
Octane recommendation
Your vehicle is designed to use regular gasoline with an
(R+M)/2 octane rating of 87.
We do not recommend gasolines
labeled as “regular” in high altitude areas that are sold with
octane ratings of 86 or even less.
Typical octane rating label
Do not be concerned if your vehicle sometimes knocks lightly.
However, if it knocks heavily under most driving conditions on
the recommended octane fuel, see your dealer or a qualified
service technician to prevent any engine damage.