Does Transmission Fluid Need to Be Changed?
3 Answers
Transmission fluid does need to be changed. Here are the relevant details about transmission fluid replacement: 1. Dry dual-clutch transmissions and manual transmissions have similar structures, so they both use synthetic transmission fluid with a service life of approximately 150,000 kilometers. Most automatic transmissions require fluid replacement every 60,000-80,000 kilometers. 2. The transmission fluid replacement interval is only a general guideline. Due to factors such as driving conditions and habits, the condition of the transmission fluid may vary. If the vehicle experiences symptoms like rough shifting, strong jerking sensations, or significantly increased noise during operation, it's necessary to check whether the transmission fluid needs replacement. 3. There are three common methods for changing transmission fluid: (1) Gravity drain: Similar to engine oil changes, this involves loosening the transmission drain plug to release the fluid, then refilling through the fill port. The drawback is that gravity draining doesn't completely remove all old fluid. (2) Machine flush: A transmission flush machine connects to the transmission's fluid lines, using new fluid to push out the old fluid from inside the transmission. The advantage is more thorough replacement, while the disadvantages include being time-consuming and requiring more transmission fluid. (3) Removing the transmission pan: The advantage is the ability to clean or directly replace the transmission filter, with relatively thorough fluid replacement. The drawback is the more complicated installation process.
Transmission fluid definitely needs to be changed, and this is not something to be taken lightly. In my daily work helping people repair cars, I've encountered too many cases where owners thought the fluid was still usable, only for it to deteriorate and become dirty, increasing internal friction in the transmission. This causes gear shifts to become jerky and, over time, can lead to major transmission overhauls. Manual transmissions are relatively more durable, requiring fluid changes approximately every 40,000 kilometers, while automatics need more frequent attention, with checks and changes recommended around every 60,000 kilometers. Failing to change the fluid in time can cause the transmission to overheat, shortening its lifespan, and repairs can easily cost thousands. I advise car owners to stick to regular maintenance schedules and not skimp on these costs. Additionally, depending on driving habits—such as frequent stop-and-go traffic or long highway drives—it's wise to check the fluid condition more often. This isn't meant to scare anyone; safety truly comes first. While simple checks of fluid level and color can be helpful, I strongly recommend having this handled by a professional shop.
Speaking of transmission fluid changes, I've learned my lesson the hard way. A few years ago, when driving long distances, I always thought changing the fluid was a waste of time. As a result, after driving 80,000 kilometers, there was a rattling noise during acceleration. Upon inspection, it was found that sludge had accumulated too much, nearly ruining the transmission. After replacing the fluid, the car ran much smoother, just like when it was new. Now, I proactively change it every 3 years or 60,000 kilometers. I recommend car owners pay more attention to the manual's recommendations, such as more frequent changes for manual transmissions; if the fluid hasn't been changed for too long, it can reduce lubrication effectiveness and affect gear lifespan. Always be alert to unusual sounds while driving, and addressing issues early saves both money and hassle. Don't be as careless as I was back then—safe driving is paramount.
