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WARNING!
To avoid the risk of forcing the vehicle off the jack, do
not tighten the lug nuts/bolts fully until the vehicle
has been lowered. Failure to follow this warning may
result in personal injury.
FUEL REQUIREMENTS
While operating on gasoline with the required octane
number, hearing a light knocking sound from the
engine is not a cause for concern. However, if the
engine is heard making a heavy knocking sound, see a
dealer immediately. Use of gasoline with a lower than
recommended octane number can cause engine failure
and may void the New Vehicle Limited Warranty.
Poor quality gasoline can cause problems such as hard
starting, stalling, and hesitations. If you experience
these symptoms, try another brand of gasoline before
considering service for the vehicle.
3.6L ENGINE
Do not use E-85 flex fuel or ethanol blends greater than
15% in this engine.
This engine is designed to meet all emis-
sions regulations and provide optimum fuel
economy and performance when using high
quality unleaded regular gasoline having a
posted octane number of 87 as specified by the (R+M)/
2 method. The use of higher octane premium gasoline
is not required, as it will not provide any benefit over
regular gasoline in these engines.
5.7L ENGINE
Do not use E-85 flex fuel or ethanol blends greater than
15% in this engine.
This engine is designed to meet all emis-
sions regulations and provide satisfactory
fuel economy and performance when using
high-quality unleaded gasoline having an
octane range of 87 to 89 as specified by the (R+M)/
2 method. The use of 89 octane plus gasoline is recom-
mended for optimum performance and fuel economy.
6.2L SUPERCHARGED AND 6.4L
ENGINE
Do not use E-85 flex fuel or ethanol blends greater than
15% in this engine.
This engine is designed to meet all emis-
sions regulations, provide optimal fuel
economy and performance when using high-
quality unleaded premium gasoline having a
posted octane number of 91 as specified by the (R+M)/
2 method. The use of 91 or higher octane premium
gasoline is required for this engine.
REFORMULATED GASOLINE
Many areas of the country require the use of cleaner
burning gasoline referred to as “reformulated gasoline”.
Reformulated gasoline contains oxygenates and are
specifically blended to reduce vehicle emissions and
improve air quality.
The use of reformulated gasoline is recommended.
Properly blended reformulated gasoline will provide
improved performance and durability of engine and fuel
system components.
MATERIALS ADDED TO FUEL
Besides using unleaded gasoline with the proper
octane rating, gasolines that contain detergents, corro-
sion and stability additives are recommended. Using
gasolines that have these additives will help improve
fuel economy, reduce emissions, and maintain vehicle
performance.
Designated TOP TIER Detergent Gasoline
contains a higher level of detergents to fur-
ther aide in minimizing engine and fuel sys-
tem deposits. When available, the usage of
TOP TIER Detergent Gasoline is recommended. Visit
www.toptiergas.com for a list of TOP TIER Detergent
Gasoline retailers.
Indiscriminate use of fuel system cleaning agents
should be avoided. Many of these materials intended
for gum and varnish removal may contain active sol-
vents or similar ingredients. These can harm fuel sys-
tem gasket and diaphragm materials.
GASOLINE/OXYGENATE BLENDS
Some fuel suppliers blend unleaded gasoline with oxy-
genates such as ethanol.
Torque Patterns
302 TECHNICAL SPECIFICATIONS
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