Fuel Requirements; Diesel Fuel Specifications; Biodiesel Fuel Requirements - Jeep Grand Cherokee 2018 Manual

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 emis-
sions 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 (for-
merly known as the American Society for Testing
and Materials) specification D-975 Grade
S15 will provide good performance. If the ve-
hicle 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.
WARNING!
Do not use alcohol or gasoline as a fuel
blending agent. They can be unstable under
certain conditions and hazardous or explo-
sive 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
46
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.
CAUTION!
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.

Diesel Fuel Specifications

This diesel engine has been developed to take
advantage of the high energy content and gen-
erally 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 sys-
tem could occur. Please call your authorized
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.

Biodiesel Fuel Requirements

A maximum blend of 5% biodiesel meeting
ASTM specification D975 is recommended for
use with your diesel engine. If frequent opera-
tion with Biodiesel blends that are between 6%
and 20% (B6–B20) is desired, the maintenance
schedule is subject to shorter intervals.
The oil and filter change along with fuel filter
replacement is subject to shorter intervals when
operating your engine on biodiesel greater than
5%. Do not use biodiesel greater than 20%.
For regular use of biodiesel blends between 6%
and 20% (B6–B20) it is important that you
understand and comply with these require-
ments. Refer to the "Maintenance Plan" in
"Scheduled Servicing" for further direction.
CAUTION!
Failure to comply with Oil Change require-
ments for vehicles operating on biodiesel
blends between 6% and 20% (B6–B20) will
result in premature engine wear. Such wear
is not covered by the New Vehicle Limited
Warranty.