At what temps do you plug in your block heater?

[Mickey D]

Block heater is 71 - 120 watts for a duramax.

View attachment 221726

Correction for above; Duramax Block heater will draw approximately 1200 watts @ 120 VAC

 

[North to Alaska]

I don’t bother to plug mine in till it gets to -30f
A good 0wXX oil is all you need and it will start right up.
Just my 2 cents