How often should the transmission fluid be changed in a BMW 5 Series?

[LaJames]

BMW 5 Series transmission fluid should be changed every 80,000 kilometers. The methods for changing BMW 5 Series transmission fluid are as follows: 1. Gravity Drain: After loosening the tightening nut at the bottom of the oil pan, the transmission fluid will automatically flow out from the drain hole. This method is simple but cannot completely drain the transmission fluid, as residual fluid often remains in the grooves and recesses of the machinery. 2. Machine Flush: New transmission fluid is stored inside the flushing machine, which is connected to the transmission via pipeline interfaces. Under hydraulic pressure, the new fluid pushes out the old fluid. This method cleans the fluid passages more thoroughly.