How to Determine Whether to Change Transmission Fluid?

2 Answers
StJuliet
07/30/25 12:27am
Methods to determine if transmission fluid needs replacement are: 1. Manual transmission fluid should be changed every 40,000 kilometers or 2 years, while automatic transmission fluid should be changed every 60,000 kilometers or 3 years; 2. Judge whether the transmission fluid needs replacement by daily shifting experience. When you feel the gear shifting becomes stiff or unsmooth, accompanied by transmission noise, vehicle shaking, or slow acceleration, it indicates the transmission fluid needs changing. More details are as follows: 1. Transmission fluid is an oil product that keeps the shifting system clean, ensuring normal operation of the transmission and extending the lifespan of the transmission components. 2. Depending on the transmission structure, transmission fluid is divided into automatic transmission fluid and manual transmission fluid. 3. Automatic transmission fluid is specifically designed for automatic transmissions, serving as both the hydraulic fluid for the torque converter and the lubricant for the planetary gear structure and shifting mechanism. 4. Manual transmission fluid is generally referred to as gear oil, used for lubricating spur and bevel gears, as well as gears in transmissions and steering mechanisms under normal load conditions.
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DelTheo
08/15/25 5:05am
I've been driving for over ten years, and determining whether to change the transmission oil mainly relies on experience and observation. First, check the odometer—manufacturers usually recommend changing it every 60,000 to 100,000 kilometers. But my old car, which often gets stuck in city traffic, had the oil changed at just 30,000 kilometers because it degrades faster under such conditions. Next, inspect the transmission oil: after starting the engine, pull out the dipstick. The oil should normally be bright red or clear. If it’s black like ink or has a burnt smell, it’s time for a change. Last week, I checked my neighbor’s car and found particles in the oil, indicating transmission wear. They delayed the change, and it ended up costing thousands in repairs. Finally, pay attention to how the car drives—if you notice jerky shifting or sluggish acceleration, the oil is no longer effective. Regular maintenance according to the manual saves big money—don’t procrastinate.
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