The oil level is correct if the gearbox is filled to the lower edge of the oil filler hole. Screw in the screw "arrow". Tightening torque: Oil filler plug thread: 25 Nm.
When adding new oil, unscrew the "arrow" bolt, fill the transmission oil to the lower edge of the oil filler hole. Screw in the "arrow" screw. Start the engine, set the gear and let the gearbox run for about 2 minutes. Turn off the engine and unscrew the "arrow" screw. Add transmission oil again to the lower edge of the filler hole. Screw in the "arrow" screw.