Fluid type is given in Specifications. The possibility of using other ATF fluids should be clarified with BMW.
1. Stop the engine and remove the hydraulic reservoir cap.
2. Run the engine to idle. Fill with oil immediately to the bottom mark "MIN" -2-.
The oil pump must not operate without oil.
3. Slowly turn the steering wheel left and right until it stops two times in each direction.
4. Check the oil level in the reservoir again. Add oil if necessary.
5. Stop the engine and check the oil level again.
6. Add oil up to the mark "MAX" -1-. Add oil in small doses. The total volume of oil in the hydraulic system: 1.2 l.
7. Close the tank with a stopper.
8. The oil level on a cold engine must be between the MIN and MAX marks on the level indicator. Oil is considered cold at a temperature of +20°C.