Ford Mustang Owners Manual: Fuel quality

Note

: Use of any fuel other than those recommended may cause powertrain damage and a loss of vehicle performance; repairs may not be covered under warranty.

Choosing the Right Fuel

Use only unleaded fuel or unleaded fuel blended with a maximum of 15% ethanol. Do not use fuel ethanol (E85), diesel fuel, fuel- methanol, leaded fuel or any other fuel because it could damage or impair the emission control system.

Octane Recommendations

3.7L V6 engine
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. Do not use fuels with octane posted on pump below 87.

5.0L V8 engine
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 use fuels with octane posted on pump below 87.

Premium fuel will provide improved performance and is recommended for severe duty usage, such as trailer tow.

For Shelby GT500 octane requirements, see the Shelby GT500 Supplement.

Do not be concerned if your engine sometimes knocks lightly. However, if it knocks heavily while you are using fuel with the recommended octane rating, see your authorized dealer to prevent any engine damage.

    Safety precautions
    WARNING: Do not overfill the fuel tank. The pressure in an overfilled tank may cause leakage and lead to fuel spray and fire. WARNING: The fuel system may be under pressure. If you hear a hissing ...

    Running out of fuel
    Avoid running out of fuel because this situation may have an adverse effect on powertrain components. If you have run out of fuel: You may need to cycle the ignition from off to on several times ...

    Other materials:

    Installation
    Removal 1. Remove the differential assembly from the differential housing. For additional information, refer to Differential Case in this section. 2. CAUTION: Record the torque necessary to maintain rotation of the drive pinion gear through several revoluti ...

    Caliper (Disassembly and Assembly)
    Rear Disc Brake (Description and Operation) WARNING: Brake fluid contains polyglycol ethers and polyglycols. Avoid contact with eyes. Wash hands thoroughly after handling. If brake fluid contacts eyes, flush eyes with running water for 15 minutes. ...

    Overdrive Servo
    Transmission Description (Description and Operation) The 4R70W has the following features: Wide ratio gears Four speeds Rear wheel drive Automatic Electronic shift Torque converter clutch control Line pressure controls The transm ...