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Light spark knock at low engine speeds is not harmful to
your engine. However, continued heavy spark knock at
high speeds can cause damage and immediate service is
required. Poor quality gasoline can cause problems such
as hard starting, stalling, and hesitations. If you experi-
ence these symptoms, try another brand of gasoline
before considering service for the vehicle.
Over 40 auto manufacturers worldwide, have issued and
endorsed consistent gasoline specifications (the World-
wide Fuel Charter, WWFC), which define fuel properties
necessary to deliver enhanced emissions, performance,
and durability for your vehicle. The manufacturer recom-
mends the use of gasoline that meets the WWFC speci-
fications, if they are available.
Reformulated Gasoline
Many areas of the country require the use of cleaner
burning gasoline, referred to as “Reformulated Gaso-
line.” Reformulated gasolines contain oxygenates, and
are specifically blended to reduce vehicle emissions and
improve air quality.
We strongly support the use of reformulated gasolines.
Properly-blended reformulated gasolines will provide
excellent performance and durability for the engine and
fuel system components.
Gasoline/Oxygenate Blends
Some fuel suppliers blend unleaded gasoline with oxy-
genates such as 10% ethanol, MTBE and ETBE. Oxygen-
ates are required in some areas of the country, during the
Winter months, to reduce carbon monoxide emissions.
Fuels blended with these oxygenates may be used in
your vehicle.
298 STARTING AND OPERATING