在更換變速箱油時，目前主要有重力換油和循環機換油兩種方法 。重力換油是一種較為傳統的方式，操作簡單，就像給汽車換機油一樣，通過擰下變速箱底部的放油螺絲，讓舊油在重力作用下自然流出，然后再加入新的變速箱油。這種方法的優點是成本較低，用油量相對較少，而且操作過程相對簡單，一般的維修店都能進行。然而，它的缺點也很明顯，由于變速箱內部結構復雜，存在許多溝壑和拐角，重力換油很難將舊油完全排出，通常只能更換出約 50% - 60% 的舊油 ，這就意味著新加入的油會與殘留的舊油混合，從而影響新油的性能和使用壽命，也會縮短變速箱的保養周期。

　　There are currently two main methods for changing transmission oil: gravity oil change and circulation machine oil change. Gravity oil change is a relatively traditional method with simple operation, just like changing the oil in a car. By unscrewing the oil drain screw at the bottom of the gearbox, the old oil can naturally flow out under the action of gravity, and then new gearbox oil can be added. The advantages of this method are lower cost, relatively less oil consumption, and relatively simple operation process, which can be carried out by general repair shops. However, its drawbacks are also obvious. Due to the complex internal structure of the gearbox, there are many grooves and corners, and gravity oil change is difficult to completely drain the old oil. Usually, only about 50-60% of the old oil can be replaced, which means that the newly added oil will mix with the residual old oil, thereby affecting the performance and service life of the new oil and shortening the maintenance cycle of the gearbox.

　　循環機換油則是一種相對較新的技術，它通過循環機將新油和舊油進行動態交換。在更換過程中，先將舊油從變速箱中排出一部分，然后連接循環機，啟動車輛，讓循環機以一定的壓力將新油注入變速箱，同時將舊油擠出，使新油在變速箱內形成一個循環，直到排出的油和新注入的油顏色基本一致，表明舊油已被大部分替換。這種方法的優點是換油更徹底，能夠更換出 80% - 90% 以上的舊油 ，大大減少了舊油對新油的污染，能讓變速箱在更清潔的環境下工作，從而延長變速箱油的保養周期，對變速箱的保護也更加到位。不過，循環機換油也有其不足之處，首先是操作流程相對復雜，需要專業的設備和技術人員進行操作；其次，它的成本較高，因為在換油過程中需要使用更多的新油，一般來說，循環機換油比重力換油要多消耗 4 - 5L 的新油，這就導致了整體費用的增加，而且循環機工作時會給變速箱施加一定的壓力，雖然在正常情況下不會對變速箱造成損傷，但理論上存在一定的風險。

　　The oil change of the circulation machine is a relatively new technology, which dynamically exchanges new and old oil through the circulation machine. During the replacement process, first drain a portion of the old oil from the gearbox, then connect the circulation machine, start the vehicle, and allow the circulation machine to inject new oil into the gearbox with a certain pressure. At the same time, squeeze out the old oil to form a cycle in the gearbox until the color of the drained oil is basically the same as that of the newly injected oil, indicating that most of the old oil has been replaced. The advantage of this method is that the oil change is more thorough, and more than 80% -90% of the old oil can be replaced, greatly reducing the pollution of old oil to new oil, allowing the gearbox to work in a cleaner environment, thereby extending the maintenance cycle of gearbox oil and providing better protection for the gearbox. However, the oil change of the circulation machine also has its shortcomings. Firstly, the operation process is relatively complex and requires professional equipment and technical personnel to operate; Secondly, its cost is relatively high because more new oil needs to be used during the oil change process. Generally speaking, changing oil in a circulation machine consumes 4-5L more new oil than changing oil by gravity, which leads to an overall increase in cost. Moreover, when the circulation machine works, it will apply a certain pressure to the gearbox. Although it will not cause damage to the gearbox under normal circumstances, there is a certain theoretical risk involved.

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