How Often Should Transmission Fluid Be Replaced?
2 Answers
Transmission fluid should typically be replaced every two years or after driving approximately 50,000 to 80,000 kilometers. Vehicle owners can determine whether to replace the transmission fluid based on the operating condition of the car's transmission. If the vehicle experiences rough shifting, especially when the transmission noise becomes noticeably louder at speeds exceeding 100 kilometers per hour, it may be time to consider replacing the transmission fluid. When selecting transmission fluid for replacement, it is crucial to strictly adhere to the manufacturer's specifications and opt for fluids specifically designed for the vehicle model. Avoid using counterfeit or substandard transmission fluids. It is important to note that transmission fluid cannot be completely drained using atmospheric pressure alone, as this method only removes about half of the used fluid. The remaining fluid, along with sludge and impurities, can accumulate in the valve body, torque converter, and cooling lines, potentially leading to blockages in the system's internal passages.
After driving several cars, I feel there's no hard and fast rule for transmission fluid changes, but generally it's every 2 to 5 years, preferably based on the vehicle manual's recommendations. My old car's manual stated a change every 40,000 kilometers or 3 years, which I strictly followed; otherwise, the transmission could overheat or wear out, leading to sluggish shifting and increased fuel consumption. In real life, if you're stuck in city traffic daily or frequently drive on highways, the fluid degrades faster and needs earlier replacement; whereas relaxed rural driving can stretch to the upper limit. Don't forget to check the fluid's color—if it turns black or has a burnt smell, act immediately. Neglecting this could mean repair costs in the thousands or even total transmission failure. I recommend regular check-ups at a professional shop and inquiring about the vehicle's service history to avoid unnecessary expenses and extend the car's lifespan.
