Engine Idling; Stopping The Engine - Jeep Grand Cherokee 2018 Manual

• 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. Refer to "Fuel Requirements" in
"Technical Specifications" for further informa-
tion.
• If climatized or diesel 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
Refer to "Dealer Service" in "Servicing And
Maintenance" for the correct engine oil viscosity.
Driving Condition
Stop and Go
Stop and Go
Highway Speeds
City Traffic
Highway Speeds
Uphill Grade
20
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 com-
bustion chamber temperatures can drop so low
that the fuel may not burn completely. Incom-
plete combustion allows carbon and varnish to
Load
Empty
Medium
Medium
Maximum GCWR
Maximum GCWR
Maximum GCWR
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.

Stopping The Engine

After full load operation, idle the engine for a few
minutes before shutting it down. This idle period
will allow the lubricating oil and coolant to carry
excess heat away from the turbocharger.
NOTE:
Refer to the following chart for proper engine
shutdown.
Turbocharger Temperature
Cool
Warm
Hot
Idle Time (min.) Before Engine
Shutdown
None
0.5
1.0
1.5
2.0
2.5