Living in canada and working construction, i can verify, some trucks do idle 10 hours a day, 5 days a week minimum. Mainly foreman, supervisors. Also, keep an eye on the grid heater bolt.
I had a cummins ram as a company truck out in the field for years. If it wasn't pulling a loaded dovetail it waa idling. In the winter it was my warmth, in the summer it was a place to cool off. It handled it just fine. That said, id never do that to my own truck.
Idling is the hardest thing on a engine. If they change is on hours or figure in the hours with milage and high idle the engine it's fine. Most people do not. My 2006 6.0 manual says 25 mi per hour.
I think with the higher injection pressure & better fuel atomisation at the injectors. The engine runs alot cleaner. Its almost like burning a gas. Almost like converting the diesel into propane & burning it in that state. Almost.
it has fast idle, I won't worry about it, with high oil pressure, bearings are floating in oil, no wear at all. High injection pressure produce less particulate, clean oil. Transmission is weaker than engine. Not sure about Aisin, but Zf6hp will not lockup TC 100% to make power smooth, that wears out the TC.
The Aisin seems to lock up when towing at highway speed. It will bog down when going up grade with out shifting. Then unlocks & shifts when really gets bogged down or when lay on the throttle. Thats in tow/haul mode. Im sure the touque converter locks up when driving normal with out a trailer or load. Thats silly a torque converter that doesnt lock up. Maybe thats how Dodge got around blowing up transmisions. By cushioning the power until the truck was off warrenty.
Ram with an Aisin transmission has the Hi Output engin that has lower compression at about 17 to 1 so harder to start in cold weather. They also get poorer fuel economy over the standard Output cummins. They were designed for continuous towing and work great for that application.
See if that truck still has no provision for unlocking the front drive line in 2wd. In 2010 ish dodge did away with it keeping the 4wd system spinning full time causing failures that wipe out everything after 200k miles more or less. If they still do don't unlock anything check your front driveshaft and I'd put hubs in.
How low a bit low? 6.7l everything is computer controlled. Possible the Alfa obd scanner/programmer can adjust factory Idle setting, best not to play with it though. If lower than should be then perhaps have a failed sensor somewhere, but if it is just preference, I would leave it alone to factory spec. Can always put it on high idle.
I had an 18 ram and it randomly would rest the idle hours. So whoever bought it used probably thought it had really low idle hours but honestly I had more idle hours than drive hours on that truck when I traded it in…
