Re: Preheating of the engine
Other than getting the engine to start faster/better, the idea of pre-heat is get the juices [oil] flowing quicker. Most wear occurs upon start-up.
Some engine heaters, if not installed correctly, turn the engine into nothing more than a still and can cause more damage than help.
On some larger air-cooled engines the feather pumps could be run to help pre-lube the engine. Plus, most if not all air-cooled stuff would frost over when cranked in cold weather and refuse to start unless pre-heated.
I'm one that keeps a blanket over the old diesel tractor with a trouble light tucked under it to keep things [ especially the fuel] a bit warm.
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