Cars don't need oil for heating. Because heating transfers part of the heat originally emitted by the water tank to the carriage, heating does not affect the power and does not consume oil.
The warm air of the car is blown into the car by the heat generated by the engine. If the engine generates enough heat to provide heat, there will be no excess fuel consumption. However, if the heat generated by the engine is not enough for heating, it will still produce a certain fuel consumption for heating.
The heat source comes from the engine coolant, and the water heating system is mostly used in cars, trucks and buses with low heating requirements. Water heating and warm air system is mainly composed of heater, hot water regulating valve, blower and control panel. Among them, the blower is composed of adjustable speed DC motor and squirrel cage fan, which is used to blow cold air to the heater, and the cold air is heated and sent into the car. By adjusting the speed of the motor, the air supply to the compartment can be adjusted.