Can engine heater reduce/prevent engine corrosion?

[A Martin]

Which is why a hundred million Americans preheat their autos every morning at temperatures below 40F. Gall could not care less about metal temperatures. Gall likes oil film breakdown when oil is to thin to prevent metal to metal.

Partly true .... galling can also occur on unlubricated warm metal as well ... but increases on cold metal .... cold metal becomes harder (more brittle) ... warm metal is less brittle .... our connecting rod bearings and crankshaft main bearings are soft metal thus cold effects them more .

All this is on the molecular level of course , and invisible to us , but a good example is say a tough F450 truck with strong components throughout ..... put that truck in Yellowknife and right around -40 degrees axles will break , u-joints break , suspension components will break.