Generally, it should be controlled above 90 degrees Celsius. You can't run immediately after the car starts, because the idle speed of the car was quite high at the beginning and it didn't reach the best lubrication state. Running at this time will inevitably increase the engine load and accelerate wear. The correct way is to let the vehicle warm up at the natural idle speed until the water temperature starts to rise, and then start again after the idle speed returns to normal. Don't think that refueling can shorten the preheating time. On the contrary, it not only costs oil, but also does great damage to the engine.
The lower the temperature, the higher the intake efficiency. As long as the engine water temperature is enough, it is best to keep the engine working water temperature between 75~98. During cold start, engine wear is the most serious, which brings great burden to crankshaft. When starting, we can find that the idle speed is obviously high, and some even reach 1500 or above. So be sure to fully warm up when you leave.
Let's talk about hot car first, mainly to make the oil achieve the best lubrication effect and the automatic transmission oil reach the working pressure. Because the crankshaft speed suddenly rises during cold start, the engine oil cannot be transported to the bearing bush position, which is easy to damage the bearing bush, shorten the service life of the engine and increase the engine noise.
Leaving after cold start, the pressure of automatic transmission accumulator is insufficient, the impact is large and the clutch plate is consumed quickly.
Therefore, the hot car ensures that the operation of the vehicle will not cause harm to all parts of the car. However, the length of the preheating process depends on the quality and season of the car. After warming up, as long as the car runs smoothly and the vibration or tremor disappears, you can start slowly.