Here's a trick
We use to take an "L" shaped stove pipe with a flexible joint at the end for a short leg "L" , place the short leg of the "L" under the engine and bring the long leg out from underneath the vehicle.� then place a propane torch at the end of the long leg.� Heat goes up to the engine through the pipe and in a short while warms the oil nicely.� Worked every time even in -40.� Course the tires are pretty frozen at that point!
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Madeline
Milko III