What is the Function of Automatic Transmission Fluid?

2 Answers
Paislee
07/29/25 1:56am
Automatic transmission fluid serves to ensure the normal operation of the transmission and prolong the lifespan of the transmission system. The signs indicating the need for automatic transmission fluid replacement are: 1. Vehicle body shaking and gear shifting jerking; 2. The dashboard displays a transmission overheating warning; 3. The car is prone to stalling; 4. Unusual noises occur. The methods for replacing automatic transmission fluid are: 1. Gravity replacement: After loosening the nut at the bottom of the oil pan, the transmission fluid will automatically drain out through the oil hole; 2. Machine circulation replacement: Connect the transmission and the circulation machine through pipeline interfaces to push out the old fluid with new fluid. The working principle of an automatic transmission is: It uses planetary gear mechanisms to change gears automatically based on the degree of the accelerator pedal and changes in vehicle speed.
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Renee
08/12/25 5:57am
After driving an automatic transmission car for many years, I've realized that transmission fluid is no small matter. It primarily lubricates the internal gears and components, reducing friction and wear to ensure smooth transmission operation. Simultaneously, it acts as a coolant, absorbing and dissipating heat generated by the engine to prevent system overheating and damage. Additionally, in automatic transmissions, the fluid serves as a hydraulic medium to transfer power and drive components, such as enabling smooth gear shifts. Its cleaning function is also essential—it flushes away metal shavings or debris to prevent clogging in the pipelines. I remember once when my car's transmission started making strange noises; upon inspection, it turned out the fluid had aged and degraded. After replacing it, the noise disappeared immediately. I recommend checking and replacing the fluid every few tens of thousands of kilometers—don't overlook this small maintenance task, or you might end up spending big on major repairs.
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