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The only time to really need to use a block heater is when temps are down in the teens, the purpose of the block heater is to warm the block by heating up the coolant which in turn warms the oil as all diesel engines have a minimum cranking speed to make the required compression to start, so with that in mind if it that's cold just plug block heater in about 8hrs before you need to start the engine as they do draw a lot of power and unless the circuit breaker is sized high enough it will trip it anyway.
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