Automatic transmission, also known as automatic transmission, Taiwan is called self-propelled transmission, Hong Kong is called automatic wave. Usually, it is a kind of automobile transmission that can automatically change the gear ratio in the course of driving, so that drivers do not have to shift gears manually. It is also used in large equipment railway locomotives.

很多汽車發燒友們都喜歡自己學點汽車維修保養方面的知識，有個小毛病就自己動手解決了，換個胎、換個機油、機濾什么的都不在話下，但是對一些新型的東西了解就不一定足夠了。比如現在越來越普遍的自動變速器，在更換它的傳動液時就不能用原來簡單的方法了。

Many automobile enthusiasts like to learn some knowledge about automobile maintenance and repair by themselves. They solve a minor problem by themselves. They can change tires, oil and filter everything, but they don't necessarily know enough about some new things. For example, now more and more popular automatic transmission, in the replacement of its transmission fluid can not be used in the original simple method.

在大多數司機眼中，更換自動變速箱中的傳動液（即atf液）和更換發動機機油是一樣的，只要找個地方把舊油一放，擰緊放油塞，把新油倒入，查查油尺就完事大吉了，其實不然。

In the eyes of most drivers, changing the transmission fluid (atf fluid) in the automatic transmission is the same as changing the engine oil. As long as you find a place to put the old oil, tighten the plug, pour the new oil into it and check the fuel ruler, you will be all right.

現代汽車自動變速器是高度精密的動力傳輸裝置，多是由電腦來控制，裝備有許多精密部件：液力變扭器、太陽輪、行星輪和復雜而細小的油道等，它們對其中的污染物和溫度變化非常敏感。如果缺少必要的保養，自動變速器會出現工作粗暴、換檔困難等故障。據統計，90%的自動變速器故障是由于傳動液污染劣化引起的。

Modern automotive automatic transmission is a highly precise power transmission device, which is controlled by computer. It is equipped with many precise components: hydraulic torque converter, solar wheel, planetary wheel and complex and small oil passage. They are very sensitive to pollutants and temperature changes. If the necessary maintenance is lacking, the automatic transmission will have some malfunctions, such as rough work, difficult shifting and so on. According to statistics, 90% of the automatic transmission failures are caused by the deterioration of transmission fluid pollution.

傳統的定期排放和加注自動變速器傳動液會在液力變扭器和變速器的冷卻管中殘留75%以上的舊傳動液，新的自動變速器傳動液加入以后，立即被系統內的舊傳動液污染，未被排出的沉積物會嚴重影響系統的工作性能。

Traditional regular discharge and filling of transmission fluids will leave more than 75% of the old transmission fluids in the cooling pipes of hydraulic torque converters and transmission. When new transmission fluids are added, they will be immediately polluted by the old transmission fluids in the system, and the unexploded sediments will seriously affect the performance of the system.

為達到徹底更換的目的，就需要使用自動變速器清洗劑來徹底清除舊液，保證100%更換自動變速器中的傳動液，另外，還可以加入保護劑和止漏劑，這些工作較好使用設備來完成。

In order to achieve the purpose of thorough replacement, it is necessary to use automatic transmission cleaner to thoroughly remove the old liquid, to ensure 100% replacement of transmission fluid in automatic transmission. In addition, protective agents and leak-proof agents can also be added. These works are best accomplished by professional equipment.