What are the disadvantages of long-term idling for a car?

[OJudah]

The disadvantages of long-term idling for a car are as follows: 1. Wastes fuel, which is the most direct impact. When idling, the vehicle consumes approximately 2 liters of fuel per hour, meaning 16 liters would be consumed over 8 hours of idling. 2. Can lead to carbon deposits. Due to the low engine speed and poor air intake efficiency during idling, combustion is not very complete, making it easier for carbon deposits to form. 3. When the engine is idling, the temperature and pressure inside the cylinders are relatively low, prolonging the preparation time for fuel ignition. Additionally, the sealing of the cylinders decreases, making it easier for knocking sounds to occur, which can shorten the engine's lifespan. 4. The engine's air-fuel mixture becomes too rich, resulting in low oxygen content in the exhaust. The unburned mixture can ignite at the location of the three-way catalytic converter, potentially damaging it.