12V won't do you any good. If you really want a warm engine, you need 110V. There is a company that sells heater "tape" that you apply to the bottom of the oil pan, and then you plug that into an outlet. Google it. The folks in Alaska love it. They will also "tape" the tranny sump as it is hard to shift when it is -40F.
I hope you are using 10W30 synthetic. A 5W30 would also be better for cold starts.
Once the engine starts, it will warm nicely all by itself without any outside help.
https://www.fleetfarm.com/detail/kat-s-silicone-hot-pad-heater/0000000047517?gclid=CjwKCAiA1uHSBRBUEiwAkBCtzfQbco_Y_r5ZTfJxo8CHbyJadsNBY4OtlUQXCyq-gp8l6PaVsGkROhoCM-EQAvD_BwE
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Keeping it running is better than buying new
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