Do I Need to Replace the Transmission Filter When Changing Transmission Fluid?
3 Answers
Replacing transmission fluid does not require changing the transmission filter. The functions of transmission fluid are: to keep the shifting system clean, and to lubricate and prolong the life of the transmission components. The warning signs that indicate a need for transmission fluid replacement are: 1. Vehicle shaking and rough gear shifting; 2. Transmission overheating warning appears on the dashboard; 3. Engine stalling; 4. Unusual noises. The steps for replacing transmission fluid are: 1. Remove the transmission guard plate, loosen the screws on the oil pan, and drain the old transmission fluid; 2. Unscrew the oil pan screws and remove the oil pan; 3. Apply sealant to the new oil pan and tighten the screws; 4. Loosen the screw on the left side of the transmission to add new fluid.
When you ask me whether you should replace the transmission filter along with the fluid, as a DIY car owner, I'd tell you: it's best to change both. The filter's job is to catch metal shavings and debris inside the transmission, protecting its vital components. Skipping the filter means your fresh fluid gets contaminated quickly, leading to rough shifting or premature wear—costing you more than a fluid-only change. I do this every 30,000 to 50,000 km, checking the filter's condition each time. Remember to warm up the car before draining for better fluid flow. While the process isn't overly complex, non-mechanically inclined folks should visit a professional shop to avoid leaks from improper sealing.
From my years of experience in auto repair, changing transmission fluid must always be paired with a new filter. The filter acts like the transmission's breathing apparatus - when clogged, it restricts oil flow, affecting cooling and lubrication. Many people try to save money by skipping the filter replacement, only to find their new fluid turns black within months, accelerating wear or causing overheating issues. Depending on the vehicle model, the filter may be located in the oil pan or internally - take care not to damage gaskets during removal. I recommend replacing the filter with every fluid change. It's a low-cost measure that extends transmission life and prevents major repairs. Maintenance manuals consistently recommend this combination - don't skip this crucial step.
