This Columbia has the DD15 motor. Not the Mercedes nor the DD60. It doesn’t use DEF but it does regen. It is a 10 speed with dual bunks and only 982,000 miles on it. I have replaced a number of items on the truck: Radiator, New Transmission, Clutch, Flywheel, Alternator, All Batteries, both Air tanks, Oil Cooler, EGR and EGR Cooler. There have been other things done to it but these are the major (costly) ones. The rubber is good but probably about ready for a 1 new drive tire.
Louisville, Kentucky, United States