It’s a constant battle to keep your diesel engine safe from harsh temperatures during the winter. The block heater is one of the many tools people can use to fight this battle.
Most block heaters heat up the coolant that flows through your motor. Even though antifreeze isn’t circulating when the engine is off, the heat from the plug transfers throughout the cooling system via this fluid and slowly creates a blanket of warmth throughout the engine block. In turn, this also keeps the engine’s oil temperature and diesel fuel from plummeting to the point of a solid, sticky mess.