Is idling for 20 minutes harmful to the car?

[OMalachi]

Idling a car for 20 minutes can cause certain damages to the vehicle. Relevant information is as follows: 1. Reasons: The main harm is that prolonged or frequent idling can lead to carbon buildup inside the engine cylinders, and the throttle may also be affected. When carbon deposits accumulate to a certain extent, the vehicle's power performance will decline, and over time, it can easily cause engine wear. During idling, the vehicle does not perform external work; the engine only overcomes its own resistance. Therefore, the engine should be turned off during long waits. 2. Damages: Prolonged idling can also increase fuel consumption. A significant portion of fuel consumption during vehicle use is due to idling. This is why vehicles often have lower fuel consumption when driving on highways, as there is minimal idling time, and the engine operates in its optimal state, resulting in higher fuel efficiency.