Fuel And Refueling; Fuel Quality - Ford Mustang Shelby GT350 2019 Manual Supplement

FUEL QUALITY

Choosing the Right Fuel
E185193
Use only premium unleaded gasoline with
a minimum pump (R+M)/2 octane rating
of 91. For optimal performance, use
premium unleaded gasoline with an octane
rating of 93 or higher.
The use of the correct fuel is an important
part of the proper maintenance of your
vehicle, and a condition of the vehicle
Warranty. For this vehicle, the use of
gasoline with an octane level of 91 or
higher is required. The use of gasoline with
an octane rating lower than 91 will
invalidate the vehicle Warranty. It can
degrade vehicle performance and lead to
severe mechanical damage.
Do not be concerned if the engine
sometimes knocks lightly. However, if the
engine knocks heavily while using fuel with
the recommended octane rating, contact
an authorized dealer to prevent any engine
damage.
We recommend Top Tier detergent
gasolines, where available to help minimize
engine deposits and maintain optimal
vehicle and engine performance. For
additional information, refer to
www.toptiergas.com.
Note: Use of any fuel other than those
recommended can impair the emission
control system and cause a loss of vehicle
performance.
Mustang (CZG) GT350, United States of America, Vehicles With: SVT Performance Package, enUSA, First-Printing

Fuel and Refueling

Do not use:
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The use of fuels with metallic compounds
such as methylcyclopentadienyl
manganese tricarbonyl (commonly known
as MMT), which is a manganese-based
fuel additive, will impair engine
performance and affect the emission
control system.
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Diesel fuel.
Fuels containing kerosene or paraffin.
Fuel containing more than 15% ethanol
or E85 fuel.
Fuels containing methanol.
Fuels containing metallic-based
additives, including manganese-based
compounds.
Fuels containing the octane booster
additive, methylcyclopentadienyl
manganese tricarbonyl (MMT).
Leaded fuel, using leaded fuel is
prohibited by law.