Jeep 2012 Grand Cherokee Owner's Manual page 547

The transmission fluid and filter should be changed if
you REGULARLY tow a trailer for more than 45 minutes
of continuous operation. Refer to "Maintenance Sched-
ule" for the proper maintenance intervals.
NOTE: Check the transmission fluid level before towing
(5.7L engine).
Electronic Speed Control – If Equipped
− Do not use in hilly terrain or with heavy loads.
− When using the speed control, if you experience speed
drops greater than 10 mph (16 km/h), disengage until
you can get back to cruising speed.
− Use speed control in flat terrain and with light loads to
maximize fuel efficiency.
Cooling System
To reduce potential for engine and transmission over-
heating, take the following actions:
− City Driving
When stopped for short periods of time, shift the trans-
mission into NEUTRAL and increase engine idle speed.
− Highway Driving
Reduce speed.
− Air Conditioning
Turn off temporarily.
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