Dodge Durango 2013 Owner's Manual page 566

564 STARTING AND OPERATING
If you REGULARLY tow a trailer for more than 45
minutes of continuous operation, then change the trans-
mission fluid and filter(s) as specified for "police, taxi,
fleet, or frequent trailer towing." Refer to the "Mainte-
nance Schedule" 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.