How Often Should the Transmission Fluid Be Changed for a BMW 3 Series?
1 Answers
For a BMW 3 Series, the transmission fluid is generally recommended to be changed every 40,000 kilometers or once a year. The purpose of transmission fluid is to form a protective layer on the surface of moving components, separating them from each other. This reduces friction, ensuring smooth operation, and minimizes heat generation and surface wear. Notes for changing transmission fluid: 1. Check the fluid level only when the engine is off, the vehicle is parked on level ground, and the transmission is cold. 2. Remove the filler plug to check the fluid level; the transmission fluid should be at the bottom of the filler hole. 3. If the fluid level is low, add transmission fluid until it begins to overflow from the filler hole, then reinstall the plug.