What he said. Summer blend diesel is awful in even mildly cold weather.
Mix some kerosene in, if you can't get #1.
MY truck is happiest with a 60/40 mix of winter blend and hydraulic oil

Seems to run on anything - 15% RUG/WMO, old diesel and 5-10% RUG, #2 and leftover
(new) motor oil, anything but water :0
Haven't tried JET-A yet, but it is supposed to be like hot #1. Needs oil.
I do put a quart of 2-stroke in if I fill both tanks with pump fuel.
Should have added to original text - I do NOT use the glow plugs when mixing RUG.
Tiny squirt of ether into the little fitting in the air cleaner lid, and a hose into the cab.
REALLY easy on the starter - no grinding. Went thru 2 starters before I found the
magic combo. Even works as intended (with the glowplugs) and straight diesel.

IDI's and Detroits. If it will burn, it will probably run on it.