That 5.9L Cummins will likely outlive me. I plan to keep this truck for the rest of my life. I trust this truck will get me anywhere, anytime and in any temps. They do salt the roads in the winter in New England, so I undercoat the truck with Fluid Film every year to prevent corrosion. Now I treat the fuel whenever the temps drop below 32F. Put it in a garage for 2 days and it started without a problem. After working with AAA for an half hour we concluded that the cold temps fully gelled my fuel and while the product (Diesel 911) can de-gel the fuel in the tank, the fuel filer was still fully frozen. It got down to -23F that night and then next morning the fuel in the truck was totally frozen. I did not plug in the truck that night, but even if I did, it would not have mattered. We went skiing in NH and stayed in a hotel. A high output or HO 5.9L Cummins had a higher compression ratio of 17.2:1, a more massive flywheel, changed fuel injection timing, and the Bosch fuel system was tuned, providing more fuel pressure and additional performance. I did learn that Diesel fuel does gel in cold temps. He custom builds transmissions for Truck Pulls. Had to replace the transmission at about 125K, but had a local guy put in a bomber transmission. BTW - I put 35 inch wheels on by only adding a 2.5 in leveler to the front end. But the 35 inch wheels got us out with no problem). (That was unintentional - we found ourselves on a snowmobile trail by accident. It's runs great in the snow, mud, rocks and even on snowmobile roads. I have been 4 wheeling in NH and ME while carrying two kayaks. On the weekends, we (wife and I) explore New England.
I use this truck as a daily driver (60 daily commute) + weekend warrior. It was a perfect break in for the new 5.9L Cummins engine. I bought this RAM brand new and its first task, after a 1000 mile break in, was to tow my 10,000 lb boat (270 Sea Ray + triple axle trailer) from Portland Oregon to Boston, MA. My 2005 Dodge 2500 5.9L Cummins has been truly tested.