Jeep 2006 Commander User Manual download pdf (Page 305)

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101

FUEL REQUIREMENTS

3.7/4.7L Engines (If Equipped)

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. Under normal conditions,

the use of premium gasoline will not provide a benefit

over high quality regular gasolines, and in some circum-

stances may result in poorer performance.

5.7L Engines (If Equipped)

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 having an octane

range of 87 to 89. The manufacturer recommends the use

of 89 octane for optimum performance. The use of

premium gasoline is not recommended. Under normal

conditions, the use of premium gasoline will not provide

a benefit over high quality regular and mid-grade gaso-

lines, and in some circumstances may result in poorer

performance.

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 experience these

symptoms, try another brand of gasoline before consid-

ering service for the vehicle.

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Jeep 2006 Commander User Manual Page 305

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