What is the standard for water content in transmission fluid?

[JaxsonFitz]

Transmission fluid should have a water content of less than 0.05%. It can be judged by fluid level, smell, and color. Transmission fluid level: If the vehicle uses the correct transmission fluid and the fluid appears healthy, be careful not to overfill when topping up, as this may have the opposite effect. A low fluid level may also indicate a leakage issue. If the fluid level remains consistently low, the vehicle should be inspected and repaired as soon as possible. Transmission fluid smell: If the transmission fluid is clean and functioning properly, it has a smell similar to engine oil. If the fluid has a burnt smell, especially accompanied by dark-colored liquid, it may indicate that the fluid has deteriorated and requires immediate inspection and repair at a professional service center such as a 4S shop. Transmission fluid color: As transmission fluid ages, its quality may degrade, and it will darken over time. Unless the fluid is dark brown or black, there is no need for excessive concern. If the fluid is black, it should be inspected and repaired immediately, as the fluid may have deteriorated, or there could be more serious issues with the transmission requiring repair or replacement.