How many kilometers to change the transmission oil?

Automatic transmission is very convenient for today's cars. After a certain mileage, the oil in the gearbox needs to be changed. But many people don't know how often to change the transmission oil. Transmission can be divided into automatic transmission and manual transmission, the frequency of replacement will be different. Here the small series for you to sort out the car transmission oil how many kilometers change, hope to bring you help!
How many kilometers to change the transmission oil
In general, it is necessary to change the automatic transmission oil every two years or every 40000 km.
Solution of automobile transmission oil
Automatic transmission oil can not be completely drained by using atmospheric pressure, so only about 1 / 2 of waste oil can be discharged. The residual oil, sludge and impurities will gather in the valve body, torque converter and cooling pipeline, resulting in the blockage of the internal oil circuit of the system.
More than 99% of the failures of the auto transformer box are caused by overheating and impurities in the ATF oil that has not been replaced for a long time. At the same time, check whether the gearbox bottom shell is deformed or whether there is oil leakage in the transmission pipeline.
Automatic transmission fluid (ATF) is a special fluid for automatic transmission. In the early days, there was no special oil for automatic transmission, but engine oil was used instead. As the working conditions and technical requirements vary greatly, the method of engine oil as automatic transmission fluid is quickly eliminated. The special oil used for automatic transmission is not only the transmission oil of hydraulic torque converter, but also the lubricating oil of planetary gear structure and the hydraulic oil of shifting device.