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.

如果溫度超過120℃，橡膠密封材料會開始變硬老化，密封不嚴滲漏，導致液壓降低。如果溫度更高，變速箱開始打滑，打滑又會反過來使溫度升得更高。（奧迪等車型就會報警，進入變速箱保護模式）如不及時解決，變速箱就會報廢。如何有效控制變速箱高溫？

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?

一個定理： 在正常的80℃工作溫度下， 溫度每上升10℃，自動變速箱油的使用壽命會減半。例如，90℃時，自動變速箱油的使用壽命會降低到75000公里。在100℃（這個溫度很多變速箱都會經常出現）時，使用壽命就只有35000公里左右。120℃時，則是15000公里。再升高10攝氏度時，使用壽命就只剩下7500公里。超過146或者148℃時，自動變速箱在1500或者2000公里前就會燒掉。

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.