Jeep 2015 Grand Cherokee - Diesel Supplement - Manual (Page 45)

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.
Driving Condition Load
Turbocharger
Temperature
Idle Time (min.) Before
Engine Shutdown
Stop and Go Empty Cool None
Stop and Go Medium 0.5
Highway Speeds Medium Warm 1.0
City Traffic Maximum GCWR 1.5
Highway Speeds Maximum GCWR 2.0
Uphill Grade Maximum GCWR Hot 2.5
NOTE: Under certain conditions the engine fan will run
after the engine is turned off. These conditions are under
high load and high temperature conditions.
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STARTING AND OPERATING 43