I would not say my old Superduty (6.0) saw -50 but it was like -35 in Canada when I was up there and it didn't sound good after sitting out a couple of days when it was that cold.I wouldn't even consider driving it until it built up some heat under the hood.I think it took almost a half hour before it sounded normal.
I was finally able to talk to a guy who drives a 6.7 up here on the north slope. His company has twenty of them. He said they have been running them for two years. I guess they have had a ton of problems from excessive idling(8-12hrs). They have their idles set between 1800-2000. I wasn't able to talk to him very long but what I got out of it was that these engines don't handle idling well(as many here have stated). That being said, he told me they still love the trucks. I'm trying to find out who wrenches on their trucks so I can get more detailed info.
I just saw my hours. It says 130 hours and 40 idling. I do not believe it. They must count every stop light and drive through . There is no way I have idled this truck for almost 1/3 of the time I have driven it.
If your not moving and the truck is running then you're idling, like it or not that's the facts of life..