Is it necessary to replace the filter when changing transmission fluid?

[JosieRose]

When changing transmission fluid, it is essential to replace the filter. Failure to do so may allow contaminants to directly enter the transmission. Transmission fluid is a lubricant that maintains the cleanliness of the gear system, primarily ensuring proper transmission operation and extending the lifespan of the transmission components. Depending on transmission design, it is categorized into manual transmission and automatic transmission. The steps for changing transmission fluid are as follows: 1. Start the engine to warm up the transmission to operating temperature; 2. Remove the drain bolt; 3. After draining the old fluid, reinstall the bolt; 4. Add new ATF fluid; 5. Shift through gears from P to N, D, L1, L2, etc., pausing for at least 5 seconds in each gear; 6. Check if the automatic transmission fluid level is normal.