Dodge 2007 DR Ram, Owner'S Manual

Page: 380 / 568

FUEL REQUIREMENTS
All engines (except 5.7L engines) are de-
signed to meet all emissions regulations and
provide excellent fuel economy and perfor-
mance when using high quality unleaded
“regular” gasoline having an octane rating
of 87. The routine use of premium gasoline
is not recommended. Under normal condi-
tions the use of premium fuel will not provide a benefit
over high quality regular gasolines and in some circum-
stances may result in poorer performance.
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 routine use
of premium gasoline is not recommended. The use of
premium gasoline will provide no benefit over high
quality regular and mid-grade gasolines, 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 “regular” gasoline be-
fore considering service for the vehicle.
Over 40 auto manufacturers world-wide have issued and
endorsed consistent gasoline specifications (the World-
wide Fuel Charter, WWFC) to define fuel properties
necessary to deliver enhanced emissions, performance
and durability for your vehicle. We recommend the use
of gasolines that meet the WWFC specifications if they
are available.
3.7L/4.7L
Engines
5.7L Engines
380 STARTING AND OPERATING