Ron
Why don't you simply install a block heater? They are very cheap and fit right into one of the frost plug (freeze plug) holes on the side of the block. Installation is quick and very simple. Plug it in for an hour or so and the engine will be nice and warm. It heats the coolant, not the
oil, but it will accomplish the same thing, a preheated engine.
These block heaters are normally used up here in cars that are parked outside in the winter. Most people up here only use them when night time temps drop down lower than -25 or -30. Even at that temperature it is only necessary to plug the heater in for an hour or two before starting the engine.
Wayne