在更换变速箱油时，目前主要有重力换油和循环机换油两种方法 。重力换油是一种较为传统的方式，操作简单，就像给汽车换机油一样，通过拧下变速箱底部的放油螺丝，让旧油在重力作用下自然流出，然后再加入新的变速箱油。这种方法的优点是成本较低，用油量相对较少，而且操作过程相对简单，一般的维修店都能进行。然而，它的缺点也很明显，由于变速箱内部结构复杂，存在许多沟壑和拐角，重力换油很难将旧油完全排出，通常只能更换出约 50% - 60% 的旧油 ，这就意味着新加入的油会与残留的旧油混合，从而影响新油的性能和使用寿命，也会缩短变速箱的保养周期。

　　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.

　　循环机换油则是一种相对较新的技术，它通过循环机将新油和旧油进行动态交换。在更换过程中，先将旧油从变速箱中排出一部分，然后连接循环机，启动车辆，让循环机以一定的压力将新油注入变速箱，同时将旧油挤出，使新油在变速箱内形成一个循环，直到排出的油和新注入的油颜色基本一致，表明旧油已被大部分替换。这种方法的优点是换油更彻底，能够更换出 80% - 90% 以上的旧油 ，大大减少了旧油对新油的污染，能让变速箱在更清洁的环境下工作，从而延长变速箱油的保养周期，对变速箱的保护也更加到位。不过，循环机换油也有其不足之处，首先是操作流程相对复杂，需要专业的设备和技术人员进行操作；其次，它的成本较高，因为在换油过程中需要使用更多的新油，一般来说，循环机换油比重力换油要多消耗 4 - 5L 的新油，这就导致了整体费用的增加，而且循环机工作时会给变速箱施加一定的压力，虽然在正常情况下不会对变速箱造成损伤，但理论上存在一定的风险。

　　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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