I've mentioned before what I do on cold mornings (below zero). Frost plug heater on a timer for 4 hours and a 200W magnetic heater on the oil pan all night. I've been curious if the pan heater did any good so I measured some temps.

It was 5 below when I placed the heater on the pan and plugged in it. In the morning 10 hours later, it was still about 5 below. I used a remote temperature sensor to measure some temps.

Oil pan 1 inch away from heater - +52 deg F
Half way up the side of the pan - +20 deg
Tranny - Minus 5

I don't know what the oil temp was but I convinced myself it's a good idea when it gets cold.

Oil Pan Heater.
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1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.