Owner's manual

FUEL REQUIREMENTS

3.7L and 4.7L Engine

All engines (except 5.7L engines) are de-

signed to meet all emissions regulations

and provide excellent fuel economy and

performance when using high quality un-

leaded “regular” gasoline having an oc-

tane rating of 87. The use of premium

gasoline is not recommended, as it will not provide any

benefit over regular gasoline in these engines.

5.7L Engine

The 5.7L engine is designed to meet all

emissions regulations and provide satisfac-

tory fuel economy and performance when

using high quality unleaded gasoline hav-

ing an octane range of 87 to 89. The manu-

facturer recommends the use of 89 octane

for optimum performance. The use of premium gasoline

is not recommended, as it will not provide any benefit

over regular gasoline in these engines.

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.

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