I appreciate the bulletin post.
No, this guys trucks coolant temp started creeping up from 210. He figured it might have been doing a regen, and kept driving. It got to 260, the truck went into reduced power mode. He got towed to the dealer and upon inspection the head gasket had failed (probably as a function of such high coolant temps) and the heads warped. (Truck had 146 miles)
Then, he got a 3.0L loaner, and had to return that truck as it did the same exact thing.
I figured it was isolated, but people in those comments that claim to have a 3.0L, or friends with a 3.0L, say it’s happened to them too. (Internet can be shady, who knows if they actually have or know of people with 3.0L Duramax with this issue).
just figured I would ask owners on a more trustworthy platform.