1. Raise the car on a lift or place it over a viewing hole.
2. On vehicles equipped with a BE3 gearbox, remove the left front wheel, unscrew the screws and remove the wheel arch protection from under the fender to access the oil fill plug. On all models, remove the mudguard from under the engine.
3. Wipe the area around the oil fill plug. On the BE3 gearbox, the oil fill plug is the largest bolt of the end cap-to-gearbox bolts. On the ML5T transmission, the oil fill plug is located on the rear of the differential housing. Remove the oil fill plug from the gearbox.
4. Place a suitable container under the oil drain plug at the rear of the gearbox and unscrew the plug.
5. Completely drain the oil from the gearbox. Clean the oil fill plug and oil drain plug of metal particles and replace the sealing washers.
6. Screw in the oil drain plug and tighten it to the required torque.
7. Fill the gearbox with oil up to the level of the lower edge of the oil filler hole.
Attention! To properly fill the gearbox, the vehicle must be in a horizontal position.
8. Screw in the oil filler cap, install the wheel and drive for a short drive. Recheck the oil level.
9. If necessary, correct the oil level, install a new sealing washer on the plug, screw the plug into place and tighten to the required torque. Install the wheel arch protection and engine mudguard.