Choosing The Right Fuel; Octane Recommendations; Fuel Quality - Ford 1999 Mustang Owner's Manual

Ford car owners guide
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Maintenance and care
If you do not use the proper fuel filler cap,
excessive pressure or vacuum in the fuel
tank may damage the fuel system or cause the fuel
system to work improperly in a collision, which
may result in possible personal injury.

Choosing the right fuel

Use only UNLEADED FUEL. The use of leaded fuel
is prohibited by law and could damage your vehicle.
Do not use fuel containing methanol. It can damage
critical fuel system components.
Your vehicle was not designed to use fuel or fuel
additives with metallic compounds, including
manganese-based compounds containing MMT.
Repairs to correct the effects of using a fuel for
which your vehicle was not designed may not be
covered by your warranty.

Octane recommendations

Your vehicle is
designed to use
"Regular" unleaded
gasoline with an
(R+M)/2 octane rating of 87. We do not recommend
the use of gasolines labeled as "Regular" that are
sold with octane ratings of 86 or lower in high
altitude areas.
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 dealer or
a qualified service technician to prevent any engine
damage.

Fuel quality

If you are experiencing starting, rough idle or
hesitation driveability problems during a cold start,
try a different brand of "Regular" unleaded gasoline.
162
87
(R+M)/2 METHOD

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1998 mustang gt

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