Does transmission fluid need to be changed after three and a half years of use?

[Phillips]

Transmission fluid needs to be changed after three and a half years of use. For manual transmissions, the fluid should be replaced approximately every two years or 80,000 kilometers, while automatic transmissions require replacement every two years or 60,000 kilometers. Below are the signs indicating the need for transmission fluid replacement and the hazards of prolonged neglect: Signs that transmission fluid needs replacement: If the transmission fluid shows signs of deterioration, such as turning black, becoming viscous, or emitting an unusual odor, it should be replaced immediately. Additionally, if the transmission frequently experiences issues like rough shifting, slipping, lack of acceleration power, or abnormal noises, it is recommended to change the transmission fluid. Hazards of prolonged neglect in changing transmission fluid: Long-term failure to replace transmission fluid can alter the pH level of the fluid, leading to corrosion of the transmission gears. Moreover, prolonged use of old fluid increases its viscosity, preventing it from effectively lubricating the entire gear mechanism in a timely manner. This can result in overheating of gears, abnormal wear of clutch plates, and other issues. The most direct symptoms include increased shifting jerkiness, longer shifting intervals, lack of power during cold starts, and vibration of the gear lever.