English 
oil temp gauge starts cold
Cold start means that the car starts directly without preheating. For cars, the engine oil just started can not fully lubricate all parts of the engine. In particular, the crankshaft is likely to cause damage. In this way, the driving capacity of the car will be reduced and the service life of the engine will be shortened. The best way to protect the engine is to warm up and run the engine for 5 to 10 minutes without load. The gasoline engine takes 15-20 minutes, and the water temperature is maintained between 60-80 degrees, which is the best temperature. Cold start means that the engine has cooled down after being shut down for a period of time, and its temperature is far lower than the normal working temperature. At the beginning again, it is a cold start. In general, we can measure it through the ambient temperature, that is, the temperature of the engine after flameout slowly cools to below 40 ℃ for about 2 hours. At this time, the restart is a cold start.
More than 80% of engine wear is caused by the cold start phase. Cold start is more difficult to start and takes longer to start. During cold start, the internal temperature is too low and the mixture is not easy to vaporize and burn; When the temperature is not enough during cold start, the cold start oil temperature will be too high, and it will take time for the oil temperature to rise, so as to accelerate the lubrication of various parts. During cold start, the clearance of internal parts is small, and preheating takes time. After preheating and expansion, it can gradually reach the specified clearance, because the clearance is too large, the oil film can not cover the lubrication.
Cold start is to start the engine when the engine water temperature is low. Hot start is to start the engine when the engine water temperature is high. The only difference is the temperature of the cooling water.
1. Cold start does more harm to the car. More than 80% of the engine wear is caused in the cold start stage.
2. Compared with hot start, cold start is more difficult to start the car and takes longer to start. There are three reasons:
a During cold start, the internal temperature of the engine is too low and the mixture is not easy to vaporize and burn;
b . During cold start, the oil temperature is not enough. Even at the moment of cold start, if the oil with appropriate viscosity is too high, it takes time to raise the oil temperature, so as to accelerate the lubrication of engine parts;
c . During cold start, the clearance between parts inside the engine is large and needs to be preheated for a long time. After preheating and expansion, the specified clearance can be gradually reached, because if the clearance is too large, the oil film cannot be covered for lubrication. It always takes time for cold oil to flow through the engine. Even if the time is short, it will take more than ten or twenty seconds, so it's good to wait for one and a half minutes.
Get a Quote / Info