Does idling for 1 hour harm the car?

[VanAlexander]

Idling for 1 hour does harm the car. Idling for twenty minutes can cause certain damage to the vehicle. The main harm is that prolonged or frequent idling can easily lead to carbon buildup inside the engine cylinders and also affect the throttle. Carbon buildup caused by idling: When carbon deposits accumulate to a certain extent, they can reduce the vehicle's power performance and, over time, easily cause engine wear. During idling, the vehicle does not perform external work. In the idling state, the engine only overcomes its own resistance, so the engine should be turned off during long waits. Idling increases fuel consumption: A significant portion of fuel consumption during vehicle use is due to idling. Therefore, it can be observed that vehicles often have lower fuel consumption when driving on highways, precisely because there is little idling time on highways, and the engine operates in its optimal state, resulting in higher fuel efficiency. If driving in congested urban areas, fuel consumption will increase significantly due to the longer idling times on city roads.