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Living in PA, I seriously doubt that it is needed. For what ever reason you want to heat the engine up to 140 degrees, your engine will start without any additional help well below zero.
To answer your question, I don't think the pan warmers will heat the oil to anywhere near 140 degrees. An additional water jacket heater will raise the temp almost to operating temp.
I thought that plugging my truck in would give me a little better mileage in the winter and if it did, it was insignificant at best. It did however give instant warm in the cab.
Jim
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2001, F250 4x4, CC, Auto; Mobil 1 in transfer case&Trans.; Frantz Bypass Filter; "Hutch" fuel mods; Sonnax/Tricum mod; 4" Exhaust, 30" MagnaFlow; Attitude in A-Pillar and tranny gauge in Dash; AIS; EASE Diagnostics; Reese Slider Hitch; Fr Rotors, Cryo Treated&Slotted by ART.
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