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STARTING AND OPERATING 145
COLD WEATHER PRECAUTIONS
Operation in ambient temperature below 32°F
(0°C) may require special considerations. The
following charts suggest these options:
Fuel Operating Range
NOTE:
Use Ultra Low Sulfur Diesel (ULSD) Fuels ONLY.
Fuel Operating Range Chart
*Number 1 ULSD Fuel should only be used where
extended arctic conditions 0°F (-18°C) exist.
NOTE:
Use of Climatized ULSD Fuel or Number 1 ULSD
Fuel results in a noticeable decrease in fuel
economy.
Climatized ULSD Fuel is a blend of Number 2
ULSD Fuel and Number 1 ULSD Fuel which
reduces the temperature at which wax crystals
form in fuel.
The fuel grade should be clearly marked on the
pump at the fuel station.
The engine requires the use of Ultra Low Sulfur
Diesel Fuel. Use of incorrect fuel could result in
engine and exhaust system damage
Ú page 420.
If climatized or Number 1 ULSD Fuel is not avail-
able, and you are operating below 20°F (-6°C),
in sustained arctic conditions, Mopar®
Premium Diesel Fuel Treatment (or equivalent)
is recommended to avoid gelling (see Fuel Oper-
ating Range Chart).
Engine Oil Usage
See Engine Fluids and Lubricants for the correct
engine oil viscosity Ú page 424.
Winter Front Cover
A Winter front or cold weather cover can be used in
ambient temperatures below 32°F (0°C),
especially during extended idle conditions. This
cover is equipped with four flaps for managing
total grille opening in varying ambient
temperatures. If a Winter front or cold weather
cover is to be used, the flaps should be in the full
open position to allow air flow to the cooling
module and automatic transmission oil cooler.
When ambient temperatures drop below 0°F
(-17°C) the four flaps need to be closed. A suitable
cold weather cover is available from a Mopar®
dealer.
Engine Warm-Up
Avoid full throttle operation when the engine is
cold. When starting a cold engine, bring the engine
up to operating speed slowly to allow the oil
pressure to stabilize as the engine warms up.
If temperatures are below 32°F (0°C), operate the
engine at moderate speeds for five minutes before
full loads are applied.
ENGINE IDLING
Avoid prolonged idling. Long periods of idling may
be harmful to your engine because combustion
chamber temperatures can drop so low that the
fuel may not burn completely. Incomplete
combustion allows carbon and varnish to form on
piston rings, cylinder head valves, and injector
nozzles. Also, the unburned fuel can enter the
crankcase, diluting the oil and causing rapid wear
to the engine.
4
22_JL_OM_EN_USC_t.book Page 145
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