When Should the Transmission Fluid of BMW 5 Series Be Replaced?

[ORonan]

The transmission fluid of BMW 5 Series should be replaced every 80,000 kilometers. If the gears shift smoothly and there is no significant change in transmission noise, replacement may not be necessary. Methods for replacing the transmission fluid in BMW 5 Series: 1. Gravity replacement. The principle is similar to oil replacement. 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. In the grooves and recesses of the machinery, the transmission fluid often cannot be fully drained. 2. Circulation machine replacement. The new transmission fluid is stored inside the circulation machine, and the transmission is connected to the machine via pipeline interfaces. Under hydraulic pressure, the new fluid pushes out the old fluid. This method cleans the oil passages more thoroughly. The more new transmission fluid used, the cleaner the cleaning. A single circulation machine replacement requires about 10-13 liters of transmission fluid and takes approximately 40-80 minutes. 3. Removing the oil pan for replacement. This method cleans from the root, achieving a more thorough cleaning, and allows for the cleaning of the transmission fluid filter.