How often should the transmission fluid of an automatic car be changed?

[LeRylee]

Automatic car transmission fluid should be changed every two years or every 40,000 kilometers, but this may vary depending on the car model, as different models have different requirements. Transmission fluid is an oil product that keeps the gear system clean, lubricates and extends the life of the transmission device, and provides effective lubrication even at low temperatures, reducing oil loss under harsh operating conditions. An automatic transmission typically refers to a car's automatic gear-shifting mechanism, where the control system of the automatic transmission selects the appropriate gear based on the engine's speed and load during driving, replacing the driver's subjective judgment and gear-shifting operations.