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block heater and/or a tank heater [heats the coolant/radiator fluid]in a cold climate is not a bad idea from the engines view point. i use a block heater if its below 10 F .
not for any fuel savings but because warm oil flows better , reduces engine wear at start up , puts less strain on an already weak battery at cold temps. lets the engine get to operating temps faster and the cabin heat works faster,,
my ford came with a block heater installed from factory.. really nice at Zero or 20 below
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