How often should the transmission fluid be changed in a Passat?

[StEliza]

The transmission fluid replacement interval for the Volkswagen Passat is every 50,000 kilometers. The methods for changing transmission fluid are as follows: 1. Gravity Drain: This works on the same principle as changing engine oil. After loosening the fastening nut at the bottom of the oil pan, the transmission fluid will automatically drain out through the drain hole. This is the most common and easiest method, but it doesn't completely remove all the old transmission fluid. Residual fluid often remains in mechanical grooves and recesses. 2. Machine Flush: New transmission fluid is added to a flushing machine, which connects to the transmission's fluid lines. The machine's function is to push out the old fluid with the new, achieving a complete replacement. This method cleans the fluid lines more thoroughly. The more new transmission fluid used, the cleaner the system becomes. A machine flush typically requires about 10-13 liters of transmission fluid and takes approximately 1 hour. 3. Oil Pan Removal: This method provides the most thorough replacement and cleaning, and also allows for cleaning or replacing the dirty filter. Removing the oil pan is a major task, and accordingly, the labor cost will be higher.