What is the difference between cold start and hot start of a car?

[DeMaximus]

Car cold start and hot start are different as follows: 1. Cold start: It means starting the engine when the water temperature is low; cold start is more harmful to the car, and more than 80% of engine wear occurs during the cold start phase. During a cold start, the gaps between various parts inside the engine are relatively large, and it takes time to warm up and reach the specified gaps through thermal expansion, because if the gaps are too large, the oil film cannot cover and lubricate. During a cold start, the internal temperature of the engine is too low, making it difficult for the air-fuel mixture to vaporize and burn. 2. Hot start: It means starting the engine when the water temperature is high, the only difference being the temperature of the cooling water between the two.