Engine Break-In Recommendations - 3.0L Diesel; Normal Operation - 3.0L Diesel Engine; Cold Weather Precautions - Jeep Grand Cherokee 2018 Manual

WARNING!
Remember to disconnect the cord before
driving. Damage to the 110–115 Volt electri-
cal cord could cause electrocution.
NOTE:
The block heater will require 110 Volts AC and
6.5 Amps to activate the heater element.
ENGINE BREAK-IN
RECOMMENDATIONS — 3.0L
DIESEL
The diesel engine does not require a break-in
period due to its construction. Normal operation
is allowed, providing the following recommenda-
tions are followed:
• Warm up the engine before placing it under
load.
• Do not operate the engine at idle for pro-
longed periods.
• Use the appropriate transmission gear to
prevent engine lugging.
18
• Observe vehicle oil pressure and tempera-
ture indicators.
• Check the coolant and oil levels frequently.
• Vary throttle position at highway speeds
when carrying or towing significant weight.
NOTE:
Light duty operation such as light trailer towing
or no load operation will extend the time before
the engine is at full efficiency. Reduced fuel
economy and power may be seen at this time.
The engine oil installed in the engine at the
factory is a high-quality energy conserving type
lubricant. Oil changes should be consistent with
anticipated climate conditions under which ve-
hicle operations will occur. The recommended
viscosity and quality grades are shown under
"Fluids And Lubricants" in "Technical Specifica-
tions" in this manual. NON-DETERGENT OR
STRAIGHT MINERAL OILS MUST NEVER BE
USED.
NORMAL OPERATION — 3.0L
DIESEL ENGINE
Observe the following when the diesel engine is
operating.
• All message center lights are off.
• Malfunction Indicator Light (MIL) is off.
• Engine Oil Pressure telltale is not illuminated.
• Voltmeter operation:
The voltmeter may show a gauge fluctuation at
various engine temperatures. This is caused by
the glow plug heating system. The number of
cycles and the length of the cycling operation is
controlled by the engine control module. Glow
plug heater operation can run for several min-
utes, once the heater operation is complete the
voltmeter needle will stabilize.

Cold Weather Precautions

Operation in ambient temperature below 32°F
(0°C) may require special considerations. The
following charts suggest these options: