Cold Weather Precautions; Fuel Operating Range; Engine Oil Usage- Page 155

2021 Jeep Gladiator Owner's Manual

Table of Contents

GETTING TO KNOW YOUR VEHICLE
GETTING TO KNOW YOUR INSTRUMENT PANEL
WARNING LIGHTS AND MESSAGES
STARTING AND OPERATING
MULTIMEDIA
SAFETY
OCCUPANT RESTRAINT SYSTEMS
SERVICING AND MAINTENANCE
VEHICLE MAINTENANCE
TECHNICAL SPECIFICATIONS
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STARTING AND OPERATING

153

C

OLD

 W

EATHER

 P

RECAUTIONS

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 crys

-

tals 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 484.

If climatized or Number 1 ULSD fuel is not 

available, 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 Operating Range Chart).

Engine Oil Usage

See Engine Fluids and Lubricants for the correct 

engine oil viscosity  

Ú

page 489.

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.

E

NGINE

 I

DLING

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

21_JT_OM_EN_USC_t.book  Page 153  

Detailed Information for 2021 Jeep Gladiator Owner's Manual

Lists of information found in 2021 Jeep Gladiator Owner's Manual - Page 155

  • 84.  If climatized or Number 1 ULSD fuel is not available, 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 Operating Range Chart).
  • 89. Engine Warm-Up Avoid full throttle operation when the engine is cold.

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