Note: Fill the gearbox with Elf brand oil of 75W80 viscosity. No oil change required (just topping up) throughout the entire service life of the gearbox.
1. Unscrew the filler plug, placing a container underneath in case of oil leakage.
2. Check the oil level: it should be at the level of the lower edge of the filler hole.
3. If necessary, add oil using a syringe...
Caution! Do not pour oil through the gearbox breather hole.
4. ...until it appears from the filling hole.
5. Screw the filler cap back on.