checking oil FORD MUSTANG 2003 4.G SVT Supplement Manual

OCTANE RECOMMENDATIONS
Your vehicle is designed
to use“Premium”
unleaded gasoline with
an (R+M)/2 octane
rating of 91 or higher for optimum performance. The
use of gasolines with lower octane ratings may
degrade performance. We do not recommend the
use of gasolines labeled as“Premium”in high
altitude areas that are sold with octane ratings of
less than 91.
If your engine knocks 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.
CHECKING ENGINE COOLANT
The concentration and level of engine coolant should
be checked at the mileage intervals listed in the
scheduled maintenance guide. The coolant
concentration should be maintained at 50/50 coolant
and water, which equates to a freeze point of -36°C
(-34°F). Coolant concentration testing is possible
with a hydrometer or antifreeze tester (such as the
Rotunda Battery and Antifreeze Tester,
0014–R1060). The level of coolant should be
maintained at the“cold full”of“cold fill range”level
in the coolant reservoir. If the level falls below, add
coolant per the instructions in theAdding Engine
Coolantsection.
Your vehicle was factory-filled with a 50/50 engine
coolant and water concentration. If the
concentration of coolant falls below 40% or above
60%, the engine parts could become damaged or not
work properly.A50–50 mixture of coolant and
water provides the following:
•freeze protection down to -36°C (-34°F).
•boiling protection up to 129°C (265°F).
•protection against rust and other forms of
corrosion.
91(R+M)/2 METHOD
Maintenance
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