What Color of Transmission Fluid Needs to Be Changed?
3 Answers
Transmission fluid needs to be replaced when it turns black or becomes cloudy. Below are the maintenance methods for the transmission: 1. Regularly inspect the transmission: It is essential to check the fluid level in the transmission to ensure it remains within the specified range. Refill as needed based on actual working conditions, ensuring the newly added fluid is of the same type. When changing the fluid, take advantage of the transmission's operation to promptly drain the old fluid and clean the system. 2. Regularly inspect the condition of different connection points in the transmission: During routine maintenance, inspect the condition of all connection points in the transmission to promptly identify any issues such as looseness, wear, or damage. Tighten any loose connections immediately and repair or replace any damaged parts. 3. Maintenance of transmission structural components: Daily maintenance of the transmission should focus on the structural parts, including gears, bearings, and shafts. Regularly check for issues such as gear wear, chipping, or incorrect meshing.
I used to drive an old car and neglected the transmission fluid. Over time, its color gradually changed from bright red to dark brown and then to black, accompanied by a burnt smell. Once on the highway, the gear shifts became noticeably rough, and it almost broke down. That’s when I learned that the color change was a warning sign. Normally, fresh fluid is bright red, indicating good lubrication. But after a few years, oxidation darkens it, signaling the buildup of metal shavings, dirt, and moisture, which can wear down the internal gears of the transmission. Now, I check the fluid quality every three to five years or 40,000 kilometers. If I see it turning dark, I replace it immediately—no delays. Otherwise, repair costs could run into thousands, far more expensive than spending a few hundred on regular maintenance.
As an enthusiast who enjoys DIY car repairs, I often remind my friends to regularly check the transmission fluid color. The method is quite simple: start the engine, wait for it to warm up, then pull out the dipstick, wipe it clean, reinsert it, and pull it out again. If the color is fresh and clear like strawberry jam, it's good. Once it turns coffee-brown or ink-black, it must be changed immediately. This discoloration indicates fluid degradation, possibly mixed with dust and friction-generated debris. If left untreated, it can cause clutch slippage or even complete failure. I recommend checking every 50,000 kilometers. If you notice dark-colored fluid, take it to a professional shop for a fluid change—don't try to save money by delaying until problems arise. DIY maintenance also helps you learn some upkeep knowledge, saving money and giving peace of mind.
