When Should the Car Transmission Fluid Be Changed?

1 Answers
DelHarper
07/30/25 4:21am
Car transmission fluid should generally be changed every 40,000 kilometers. Transmission fluid is an oil product that keeps the gear system clean, ensuring the normal operation of the transmission and extending the lifespan of the transmission components. Transmission fluid is crucial for the transmission, as it ensures proper functioning and prolongs its service life. Performance indicators of transmission fluid: 1. Appropriate viscosity—automatic transmission fluid operates within a temperature range of -40°C to 170°C, which is quite broad. Automatic transmissions are highly sensitive to the working viscosity of the oil, and different types of transmissions require different viscosity levels. Therefore, the type of transmission fluid should not be changed arbitrarily for automatic vehicles. 2. Good anti-foaming properties—automatic transmissions can produce foam, which can cause significant harm to the transmission system. Foam can reduce the torque converter's power transmission efficiency and, in severe cases, interrupt oil supply. 3. Excellent anti-wear properties—good anti-wear performance is necessary to meet the requirements of planetary gear transmission and clutch plate operation.
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