High temperature will destroy the quality and friction characteristics of the automatic transmission oil, increase friction and wear, and the noise of the transmission will follow. At the same time, the oil sludge (impurities or dirt) will also be generated inside the transmission (such as the valve body), which will cause the transmission to falter, impact and slip.

如果温度超过120℃，橡胶密封材料会开始变硬老化，密封不严渗漏，导致液压降低。如果温度更高，变速箱开始打滑，打滑又会反过来使温度升得更高。（奥迪等车型就会报警，进入变速箱保护模式）如不及时解决，变速箱就会报废。如何有效控制变速箱高温？

If the temperature exceeds 120 ℃, the rubber sealing material will begin to harden and age, the sealing is not tight and leakage will cause the hydraulic pressure to decrease. If the temperature is higher, the transmission begins to slip, which in turn increases the temperature. (Audi and other high-end models will alarm and enter the gearbox protection mode) if not solved in time, the gearbox will be scrapped. How to effectively control the high temperature of gearbox?

一个定理： 在正常的80℃工作温度下， 温度每上升10℃，自动变速箱油的使用寿命会减半。例如，90℃时，自动变速箱油的使用寿命会降低到75000公里。在100℃（这个温度很多变速箱都会经常出现）时，使用寿命就只有35000公里左右。120℃时，则是15000公里。再升高10摄氏度时，使用寿命就只剩下7500公里。超过146或者148℃时，自动变速箱在1500或者2000公里前就会烧掉。

A theorem: under the normal working temperature of 80 ℃, the service life of automatic transmission oil will be halved every 10 ℃ rise in temperature. For example, at 90 ℃, the service life of automatic transmission oil will be reduced to 75000 km. When the temperature is 100 ℃ (this temperature is often found in many gearboxes), the service life is only about 35000 km. At 120 ℃, it is 15000 km. When the temperature is increased by another 10 degrees Celsius, the service life is only 7500 kilometers. When the temperature exceeds 146 or 148 ℃, the automatic transmission will burn down 1500 or 2000 km ago.