The Difference Between Cold Start and Hot Start of a Car

[LeonardoLynn]

Here are the specific differences between cold start and hot start of a car: 1. Starting method: Cold start refers to starting the engine after it has been turned off for a period of time, during which the engine has cooled down and its temperature is much lower than the normal operating temperature, and the engine oil has mostly flowed back. Generally, the ambient temperature can be used as a measure. After the engine is turned off, it gradually cools down to below 40℃, usually taking about 2 hours. Starting the engine at this point is considered a cold start. Hot start refers to starting the engine after it has been turned off, but the engine temperature is still near the normal operating temperature, and the engine oil on the friction surfaces has not yet flowed back, with the oil film still present. 2. Impact on the car: Cold start is more damaging to the car compared to hot start, with over 80% of engine wear occurring during the cold start phase. Cold start is also more difficult and takes longer to start the car compared to hot start.