What is the process for replacing automatic transmission fluid?
3 Answers
The process for replacing automatic transmission fluid is: 1. Drain the old automatic transmission fluid; 2. Remove the drain plug on the bottom of the automatic transmission; 3. Use compressed air to blow out the fluid from the torque converter through the filler port; 4. When adding fluid, fill with automatic transmission fluid to the specified level; 5. Drain all the fluid again and repeat steps one, two, and three; 6. Start the engine, shift through all gears and return to P (Park), and if the fluid level is low, continue adding fluid until it reaches the specified level. Transmission fluid is a lubricant that keeps the shifting system clean, ensuring the transmission operates properly and extending the lifespan of the drivetrain.
I previously changed my car's automatic transmission fluid myself, and found it quite practical. Park the car on level ground, turn off the engine, and wait for it to cool down to avoid burns. Safely lift the front with a jack, locate the drain plug on the oil pan, and use a wrench to loosen it, allowing the old fluid to drain into a pan. After draining completely, I remove the old filter and replace it with a new one to prevent contaminants from polluting the new fluid. Tighten the plug, then slowly pour new fluid through the fill port, making sure to use the exact type specified in the car manual and not to get the quantity wrong. Finally, start the engine, let the car warm up for a few minutes, cycle through the gears from P to D to circulate the fluid, and check the dipstick to ensure the fluid level is in the middle. The whole process takes a little over an hour. Those with less mechanical skill might want to get an assistant. It's recommended to change the fluid every 30,000 kilometers.
I've helped friends with oil changes many times. Ensure the car is completely cooled down and the lift is stable without any shaking. Locate the drain plug to fully drain the old oil—I make a habit of collecting and disposing of it properly to avoid environmental contamination. Most cars have an internal filter screen; take the opportunity to replace it to prevent clogging. Use a dedicated funnel to slowly pour in the new oil, matching the type specified in the manual—don't skimp and use low-quality products. Afterward, start the engine and let it idle, shifting gears a few times to circulate the oil, then check the dipstick and top up if needed. Sometimes, different car models require specific tools for oil filling, especially newer models—don't force it to avoid damaging the valves. Regular changes can prevent gearshift jerks and extend the transmission's lifespan.
