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LUBRICATION & MAINTENANCE
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 2
FLUID TYPES
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
LUBRICATION &
MAINTENANCE
DESCRIPTION
This Service Manual Supplement includes ONLY
the information that is new or updated for 2001
Model Year. All other Service Manual information
is in the 2000 Model Year Service Manual.
When you are using this information you may
be referred to another section of the Service
Manual. The refer to is written differently than
in prior years.
DESCRIPTION - FUEL REQUIREMENTS
Your engine is designed to meet all emissions regula-
tions 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
conditions the use of premium fuel will not provide a
benefit over high quality regular 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. Engine damage result-
ing from operation with a heavy spark knock may
not be covered by the new vehicle warranty.
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 world-wide have
issued and endorsed consistent gasoline specifications
(the Worldwide Fuel Charter, WWFC) to define fuel
properties necessary to deliver enhanced emissions,
performance and durability for your vehicle. We rec-
ommend the use of gasolines that meet the WWFC
specifications if they are available.
2001 JEEP WRANGLER
LUBRICATION & MAINTENANCE
TABLE OF CONTENTS
page
LUBRICATION & MAINTENANCE
MAINTENANCE SCHEDULES
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
REFORMULATED GASOLINE
Many areas of the country require the use of
cleaner burning gasoline referred to as "reformulat-
ed" gasoline. Reformulated gasoline contain oxygen-
ates, and are specifically blended to reduce vehicle
emissions and improve air quality.
We strongly support the use of reformulated gaso-
line. Properly blended reformulated gasoline will pro-
vide excellent performance and durability for the
engine and fuel system components.
GASOLINE/OXYGENATE BLENDS
Some fuel suppliers blend unleaded gasoline with
oxygenates such as 10% ethanol, MTBE, and ETBE.
Oxygenates 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.
CAUTION: DO NOT use gasoline containing METH-
ANOL. Gasoline containing methanol may damage
critical fuel system components.
MMT IN GASOLINE
MMT is a manganese-containing metallic additive
that is blended into some gasoline to increase octane.
Gasoline blended with MMT provide no performance
advantage beyond gasoline of the same octane num-
ber without MMT. Gasoline blended with MMT
reduce spark plug life and reduce emission system
performance in some vehicles. We recommend that
gasolines free of MMT be used in your vehicle. The
MMT content of gasoline may not be indicated on the
gasoline pump; therefore, you should ask your gaso-
line retailer whether or not his/her gasoline contains
MMT.
It is even more important to look for gasoline with-
out MMT in Canada because MMT can be used at
levels higher than allowed in the United States.
MMT is prohibited in Federal and California refor-
mulated gasoline.
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