Should Transmission Fluid Be Changed When It Turns Black?
2 Answers
Transmission fluid should be changed when it turns black. Here are some important considerations for changing transmission fluid: 1. Selection: It is essential to strictly follow the specified requirements when choosing transmission fluid. Opt for high-quality transmission fluid, preferably the original manufacturer's dedicated fluid. 2. Choose the appropriate viscosity: Selecting a viscosity that is too high can cause the friction surfaces to overheat and lead to unnecessary power loss. Conversely, choosing a viscosity that is too low may result in the fluid being thrown off the gear surfaces due to centrifugal force, potentially causing oil seal leaks. 3. Inspect the transmission fluid: Verify that the correct transmission fluid has been used. Using the wrong type of transmission fluid can also lead to poor engine performance.
I previously checked my car, and the transmission oil turning black doesn't necessarily mean it needs to be changed immediately. Dark oil color is usually a normal sign of aging, just like engine oil turning black, as it absorbs heat and impurities during use. I recommend first checking the oil's condition—dip your finger in a bit to feel the viscosity: if it's still smooth and odorless, it's likely fine; if it feels sticky or has a burnt smell, it might have degraded and need replacement. My automatic transmission car gets its fluid changed every 30,000 kilometers on schedule, which is safer than just judging by color and helps prevent transmission slipping issues. Remember, manual transmission oil is more durable, and even if discolored, it can last a while longer. In short, rushing to change it unnecessarily increases costs—it's better to refer to the vehicle's manual for the recommended replacement interval.
