How to Refill opel astra estate gearbox oil?

To refill the gearbox oil in an Opel Astra Estate, first, ensure the vehicle is on a level surface and safely elevated. Locate the filler plug on the gearbox, which is typically on the side, and remove it using the appropriate tool. Using a funnel or a pump, add the correct type and amount of gearbox oil until it starts to seep out of the filler hole, then replace the plug securely. Finally, check for any leaks and dispose of any used oil properly.