Technical Specifications; Fuel Requirements; Diesel Fuel Specifications - Jeep WRANGLER 2020 Owner's Manual

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FUEL REQUIREMENTS

Federal law requires that you must fuel this
vehicle with Ultra Low Sulfur Highway Diesel
fuel (15 ppm Sulfur maximum) and prohibits
the use of Low Sulfur Highway Diesel fuel
(500 ppm Sulfur maximum) to avoid damage to
the emissions control system.
Use good quality diesel fuel from a reputable
supplier in your vehicle. For most year-round
service, No. 2 diesel fuel meeting ASTM
(formerly known as the American Society for
Testing and Materials) specification D-975
Grade S15 will provide good performance. If the
vehicle is exposed to extreme cold (below 20°F
or -7°C), or is required to operate at
colder-than-normal conditions for prolonged
periods, use climatized No. 2 diesel fuel or
dilute the No. 2 diesel fuel with 50% No. 1 diesel
fuel. This will provide better protection from fuel
gelling or wax-plugging of the fuel filters.

TECHNICAL SPECIFICATIONS

Do not use alcohol or gasoline as a fuel
blending agent. They can be unstable under
certain conditions and hazardous or
explosive when mixed with diesel fuel.
Diesel fuel is seldom completely free of water.
To prevent fuel system trouble, drain the accu-
mulated water from the fuel/water separator
using the fuel/water separator drain provided
on the fuel filter housing. If you buy good quality
fuel and follow the cold weather advice above,
fuel conditioners should not be required in your
vehicle. If available in your area, a high cetane
"premium" diesel fuel may offer improved
cold-starting and warm-up performance.
If the "Water in Fuel Indicator Light" remains
on, DO NOT START engine before you drain
the water from the fuel filter(s) to avoid
engine damage. Refer to "Draining Fuel/
Water Separator Filter" in "Servicing And
Maintenance" for further information.
WARNING!
CAUTION!

Diesel Fuel Specifications

This diesel engine has been developed to take
advantage of the high energy content and
generally lower cost No. 2 Ultra Low Sulfur
diesel fuel or No. 2 Ultra Low Sulfur climatized
diesel fuels.
NOTE:
If you accidentally fill the fuel tank with gaso-

line on your diesel vehicle, do not start the
engine. Damage to the engine and fuel
system could occur. Please call an autho-
rized dealer for service.
A maximum blend of 5% biodiesel meeting

ASTM specification D-975 may be used with
your diesel engine without any adjustments
to regular service schedules.
Commercially available fuel additives are not

necessary for the proper operation of your
diesel engine.
No. 1 Ultra Low Sulfur diesel fuel should only

be used where extended arctic conditions
(-10°F or -23°C) exist.