I haven't done a whole lot of wintertime diesel driving (due to salt). I'm kinda curious how quickly the engine pops off at zero degrees. Big Blue is pretty grumpy, but this engine is a bunch less tired, and the 24V starter whips it over a bunch faster than even the 12V MT-28 gear reduction starter. The two winters that I drove Big Blue I remember conscientiously trying NOT to drive it to work in sub-zero temperatures. I knew I could get it started in the morning, thanks to the block heater. But I wasn't sure whether it would start after 8 hours of sitting in a cold parking lot. I don't remember what my coldest successful non-heated start was, but it was somewhere near zero degrees.
I do know this, The Grendel starts pretty quickly at 20 degrees, and I'll be taking notes going forward.