What happens to an engine during a cold start in sub-zero temperatures?

Cool story.
Did they mention anywhere in the videos the oil grade?

In 2015 a couple of the full size jeep guys made videos illustrating super low temperature differences.
Test 1: Three Synthetics vs a Conventional.
Amsoil Signature Series 5W-30, -51 C Pour point on data sheet
Mobil 1 High Milage 5W-30, -39 C Pour point on data sheet
Royal Purple 5W-30
Walmart Supertech 5W-30 (Conventional)


Test 2: two more synthetic 5W-30 and a 5W-40
Amsoil
Mobil 1
Castrol Edge 5W-30
Walmart Supertech 5W-30 (Synthetic)
Rotella T6 5W-40



Block heaters used to be common in New England. maybe still are.

Engine oil isnt the only oil to be concerned about at low temps. But thats another story...