Basics:
2018 3500 CTD 3.73 gears, 4x4, Aisin transmission now 41,000 miles. Bought 3/18
We tow a a 16,000 lb fifth wheel.
The first 18 months the oil temperature ran 201° under all conditions. Somewhere around the 18 month mark the oil temperature has now changed to 203° towing and not. I...