Changing gearbox oil on opel corsa 13?

To change the gearbox oil on an Opel Corsa 1.3, first ensure the vehicle is on a level surface and secure it with wheel chocks. Remove the drain plug at the bottom of the gearbox to let the old oil drain out completely, then replace the plug. Next, remove the fill plug and use a funnel to add the appropriate type and amount of new gearbox oil until it reaches the fill level. Finally, replace the fill plug and check for any leaks.