How to Properly Change Automatic Transmission Fluid?

[SadieLee]

Automatic transmission fluid should be changed as follows: 1. Remove the transmission guard plate; 2. Unscrew the drain plug at the bottom of the transmission, drain the old fluid, and then tighten the plug; 3. Open the transmission oil filler cap and add new transmission fluid until it reaches the midpoint between the upper and lower level marks. The recommended replacement interval for automatic transmission fluid is every 3 years or 60,000 kilometers. The core function of an automatic transmission is to enable automatic gear shifting. While driving, the driver operates the accelerator pedal as needed, and the transmission automatically selects the appropriate gear based on engine load and vehicle operating conditions.

[EstherDella]

I've handled automatic transmission fluid changes a few times before, and it's definitely not something where you can just use any oil. You need to confirm the correct fluid specification first by checking the vehicle manual or seeking professional advice, otherwise you could damage the transmission. The replacement process generally involves several steps: start the engine to bring the fluid up to normal operating temperature, then stop the engine and drain the old fluid by removing the transmission pan drain plug. Next, clean the pan and filter screen, and replace the filter if equipped. Reinstall and tighten the drain plug, then begin adding new fluid - use a special pump to inject it through the fill port, don't pour directly. After filling, start the engine and let it idle for a few minutes while checking the fluid level is between the marks on the dipstick; too low or too high will affect performance. Some people use a machine flush for more thorough replacement, but gravity drain works too - just make sure no air gets into the system. Overall, DIY is possible but risky; I recommend leaving it to technicians to avoid problems. Regular changes are important, typically every 2 years or 40,000 km, to prevent fluid degradation that can cause slipping and malfunctions.