How often should the transmission fluid be changed?
2 Answers
Transmission fluid should be changed every two years or every 60,000 kilometers. Automatic transmission fluid cannot be completely drained using atmospheric pressure, and only about half of the used fluid can be removed. The remaining fluid, along with sludge and impurities, accumulates in the valve body, torque converter, and cooling lines, leading to blockages in the system's internal passages. Over 99% of automatic transmission failures are caused by overheating and the accumulation of impurities due to prolonged non-replacement of ATF (Automatic Transmission Fluid). The primary function of transmission fluid is to keep the gear shifting system clean and to lubricate the transmission components, thereby extending their lifespan.
Regarding the frequency of transmission fluid changes, based on my experience as a frequent driver, it generally needs to be checked or replaced every 30,000 to 60,000 miles, depending on the vehicle type. For example, my car is an automatic, and I usually change it every two years because the manual clearly states: with more highway driving, it can be extended to 50,000 miles; but with frequent city traffic jams, the change interval should be shortened to around 30,000 miles. The key is to check the fluid quality—if the color darkens or there’s a metallic smell, it should be changed early. Otherwise, the transmission may overheat or wear out, increasing repair risks. I’ve encountered this several times—delaying fluid changes led to rough shifting and repair costs of over a thousand dollars. I recommend regularly consulting the user manual or using an app for maintenance reminders. After all, safety comes first—don’t save small money only to invite big trouble. Keeping your transmission healthy ensures a more worry-free journey on the road.
