Is It Normal for Transmission Fluid to Turn Black?
2 Answers
It is not normal. Below is relevant information about transmission fluid turning black: 1. Usually, insufficient oil leads to increased oil temperature: After high temperatures, the oil will change color. Additionally, if counterfeit transmission fluid was added or the engine crankshaft oil seal is damaged, allowing engine oil to enter the transmission, the car's transmission fluid must be replaced immediately. It is essential to use original manufacturer's transmission fluid. Along with the fluid, the transmission filter and transmission pan gasket should also be replaced, and these must be original parts as well. Moreover, it is advisable to have the work done at a reputable repair shop; otherwise, the transmission pan may develop oil leaks. 2. Regularly check the automatic transmission fluid level: The method for checking automatic transmission fluid differs from engine oil. Engine oil is checked in a cooled state, whereas transmission fluid should be preheated to about 50°C. Then, shift the gear lever through each position for 2 seconds before placing it in the parking gear. At this point, the dipstick's normal fluid level should be between the maximum and minimum lines. If it is insufficient, add the same quality fluid promptly. 3. Whether it's a manual or automatic transmission: It is generally recommended to replace the automatic transmission fluid every 12 months or 20,000 kilometers at the longest. Some vehicle manuals may specify 24 months or 40,000 kilometers. However, these are general recommendations. Due to Beijing's unique driving conditions—frequent sandstorms, road congestion, and poor air quality—it is advisable for car owners to inspect and replace the ATF (Automatic Transmission Fluid) regularly and promptly.
Blackened transmission fluid is actually abnormal. It's typically bright red or transparent. Once it turns black, it indicates the presence of metal shavings, impurities, or severe oil degradation, which serves as a warning sign of transmission wear. Automatic transmissions are prone to fluid deterioration under high temperatures, while manual transmissions are more resilient but can still develop issues. If not replaced promptly, the fluid loses its lubricating properties, leading to rough shifting, excessive noise, and even complete transmission failure, with repair costs being exorbitantly high. I check the fluid color every 40,000 kilometers and address any abnormalities immediately. Prevention is better than cure—regular maintenance is key, such as selecting the right brand of fluid and avoiding aggressive driving to extend its lifespan. Remember, small oversights can lead to major disasters.
