New Tow Vehicles - Ram 2500 CTD

JIMNLIN wrote:
Dodge/Ram engine shutdown time in the Ram truck diesel supplement pages #43 and #44 says; engine shut down time

Google your trucks year model for the correct year PDF

Stopping The Engine
Idle the engine a few minutes before routine shutdown.
After full load operation, idle the engine three to five
minutes before shutting it down. This idle period will
allow the lubricating oil and coolant to carry excess heat
away from the combustion chamber, bearings, internal
components, and turbocharger. This is especially important
for turbocharged diesel engines.
NOTE: Refer to the following chart for proper engine
shutdown.
The chart shows several scenarios from less than a min up to 5 min at max GCWR and a hot turbo.
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And from Cummins; cummins

Shut Down
Before shutting your engine down, let the turbocharger cool down. When an engine runs at maximum power/high torque, the turbocharger is operating at very high temperatures and speeds. Hot shut down can cause reduced service life which is avoidable by a minute or two of idling. Most mobile equipment applications include an adequate cooling period during parking or mooring procedures.

See hot shutdown graph.

Allow your engine to idle for 1-5 minutes to allow the high temperatures and speed to reduce and so prolong the life of your turbocharger.

I don't know of a knowledgeable diesel engine service that doesn't recommend a cool down time for a hard working turbo engine shut down period.