How Many Kilometers to Change Transmission Oil?
2 Answers
Automatic transmissions generally require an automatic transmission fluid change every 40,000 kilometers, while manual transmissions typically need a fluid change every 80,000 kilometers. Introduction to Gravity Drain Method: Similar to changing engine oil, this is the simplest and most economical method, usually requiring only 3 to 5 liters of transmission fluid. However, the drawback is that gravity draining doesn't remove all the old fluid - only about one-third of the original fluid can be drained this way. The remaining fluid, which contains the dirtiest portions, cannot be drained through the transmission pan. This method is generally not recommended. Introduction to Flush Machine Method: This method connects a transmission flush machine to the transmission's fluid lines. New fluid is added to the machine, which then "pushes" out the old fluid from the transmission. The machine cleans out metal particles and sludge from the torque converter and fluid passages. The dirtier the fluid that comes out, the cleaner the transmission becomes.
I've found that transmission fluid change intervals vary from person to person, mainly depending on the vehicle model and personal driving habits. Having driven manual transmission cars for over a decade, I typically change the fluid every 60,000 to 80,000 kilometers. However, for automatic transmissions, considering their more complex internal components and faster wear, I recommend changing it earlier, roughly between 30,000 to 60,000 kilometers. Frequent city traffic congestion increases transmission load and accelerates fluid degradation. I usually refer to the specific recommendations in the owner's manual rather than making random guesses. Regular checks of the fluid's color and smell are crucial—if it turns black or has a burnt odor, immediate action is needed. Prolonged neglect can cause the fluid to lose its lubricating properties, leading to transmission slippage or severe damage that might cost tens of thousands to repair. Developing a habit of maintenance every two years or by mileage can save significant trouble and money.
