What is the difference between cold start and hot start?

[DeAdriel]

The following are the differences between cold start and hot start of a vehicle: 1. Safety: Cold start is more harmful to the car, as more than 80% of engine wear occurs during the cold start phase. Hot start is the opposite. 2. Starting: Cold start is more difficult and takes longer to start the vehicle compared to hot start. This is because during cold start, the internal temperature of the engine is too low, making it harder for the air-fuel mixture to vaporize and combust. Additionally, during cold start, the engine oil temperature is insufficient. Even with the appropriate viscosity of oil, the viscosity is effectively too high at the moment of cold start, requiring time to raise the oil temperature to accelerate lubrication of engine components.