How long should you wait to turn off the engine after driving on the highway?

[Joan]

After high-speed driving, do not suddenly stop and turn off the engine. You should wait for more than a minute after the turbocharging system stops working before shutting it down. However, in general, it takes several minutes from leaving the highway to parking, so there is no need to extend the low-speed driving time additionally. More details are as follows: 1. Some cars can be turned off immediately after high-speed driving: Some car engines have a cooling system that can continue to operate for a while after the engine is turned off to help dissipate heat from the turbocharger. For such cars, there is no need to idle after high-speed driving; you can turn off the engine directly. 2. Cooling principle: When the engine is just started, the coolant will undergo a small cycle. At this time, the coolant does not pass through the radiator for cooling, which helps the engine warm up quickly. When the engine reaches its normal operating temperature, the coolant will switch to a large cycle, passing through the radiator to dissipate heat, thereby maintaining the engine within a reasonable temperature range.