New automatic transmission | under normal circumstances, the automatic transmission oil needs to be changed every 2 years or every 40000 km (called ATF), but it also depends on the model. Different vehicles have different requirements. It is recommended to replace every 460000 km. It is often recommended to shorten the maintenance mileage under crowded conditions.

旧车自动变速箱|二手车是指5年后或已维修变速箱4万或每年维修一次，亚洲、美洲等46档，24-4万或每年维修一次的旧车，只要强烈建议每年维修一次即可。

Used car automatic transmission | used car refers to an old car whose transmission has been repaired for 40000 km or once a year after 5 years, and whose transmission is in 4-6 gears, 240000-40000 km or once a year in Asia and America, as long as it is strongly recommended to repair once a year.

更换变速器的机油时，必须将原机油尽可能清洁。自动变速器的机油冷却器都没有卸油口。除少数型号外，大多数液力变矩器没有卸料口，控制阀体内的大部分油不能排出。按照传统的方法，只有大约60%的油可以从油底壳中释放出来。这种排油方式的效率无疑是不理想的。目前有两种较好的排油方法。一种是在热车状态下用自动变速器代替燃油装置，使90%以上的旧油可以喷射出来。

When changing the transmission oil, the original oil must be as clean as possible. The oil cooler of automatic transmission has no oil drain. Except for a few models, most hydraulic torque converters have no discharge port, and most of the oil in the control valve body cannot be discharged. According to the traditional method, only about 60% of the oil can be released from the oil pan. The efficiency of this oil drainage method is undoubtedly not ideal. At present, there are two better oil drainage methods. One is to replace the fuel device with the automatic transmission in the hot vehicle state, so that more than 90% of the old oil can be injected.

必须更换制造商指定的机油。自动变速器油可用于其他系统，如转向系统。但是，不允许在自动变速器中添加其他油，如在自动变速器中不小心添加手动变速器油，在一定距离(约100~200km)行驶后，所有离合器和制动器都会受到严重腐蚀。

The oil specified by the manufacturer must be replaced. Automatic transmission fluid can be used in other systems, such as the steering system. However, it is not allowed to add other oil to the automatic transmission. For example, if the manual transmission oil is accidentally added to the automatic transmission, all clutches and brakes will be seriously corroded after driving a certain distance (about 100 ~ 200km).

在自动变速器油中添加摩擦修饰剂，以确保离合器和制动器能够在潮湿状态下可靠地传递扭矩。不同的自动变速器有不同的负载。添加到自动变速器油中的摩擦修饰剂也有所不同。因此，自动变速器必须取代制造商指定的机油。如果添加来自不同制造商的油，可能会发生换档冲击、离合器和刹车打滑，在严重情况下还会出现齿轮跳跃。

Add friction modifier to the automatic transmission oil to ensure that the clutch and brake can reliably transmit torque under wet conditions. Different automatic transmissions have different loads. The friction modifiers added to automatic transmission oil are also different. Therefore, the automatic transmission must replace the oil specified by the manufacturer. If oil from different manufacturers is added, shift shock, clutch and brake slip and gear jump may occur in severe cases.