1997 Mercury Mountaineer Owner's Manual - Page 166
1997 Mercury Mountaineer Manual
Page 166 highlights
Maintenance and care of disulfiram for the treatment of alcoholism. Breathing gasoline vapors or skin contact could possibly cause an adverse reaction. Consult a physician immediately. Cleaner air Ford approves the use of gasolines to improve air quality, including reformulated gasolines, that contain oxygenates such as a maximum of 10% ethanol or 15% MTBE. There should be no more than 5% methanol with cosolvents. Octane recommendations 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. 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. Fuel quality If you are experiencing starting, rough idle or hesitation problems try a different brand of fuel. If the condition persists, see your dealer or a qualified service technician. The American Automobile Manufacturers Association (AAMA) 166 87