How do you change gearbox oil on a automatic vectra 08?

To change the gearbox oil on a 2008 Vauxhall Vectra automatic, start by ensuring the vehicle is on a level surface and the engine is off. Remove the drain plug to let the old oil drain out completely, then replace the plug. Next, use a funnel to fill the gearbox with the appropriate type and amount of new oil through the dipstick tube or designated fill point. Finally, check the oil level with the dipstick and ensure it’s within the recommended range before replacing the dipstick and closing any access points.