Originally Posted By: il_signore97
Originally Posted By: OVERKILL
Yup, the guy with the SuperDuty in the room next to us, who I can only assume had 15w-40 in it, still didn't have his truck running by the time we left. CAA was there and had a big portable "start cart" hooked up to it as well as a generator running the block heater
LOL... (Trying not to laugh at the expense of others, but your story is funny!!! I sure wouldn't want to be in that situation!)
There is nothing funny about it and in diesels, the oil choice has zero relevance on start vs non start condition. At those temps if the truck hasn't been plugged in or had a Webasto unit running, it simply will not start, as the diesel fuel cannot properly vaporize and generate enuogh heat through compression. You could have MMO in the crank case and it would not help one bit.
As it was mentioned many times before, running ANY oil that meets manufacturer specifications will not be a deterimental factor in a non start condition, the battery condition will.
My cars experienced the same winter sitting outside and had no trouble starting in the morning with dino juice. If I lived in a place where -35C was a routine occurrence, a good coolant and oil heater would be my first choice, not a unicorn oil.