Where to top up gearbox oil on vauxhall combo 2004 van?

To top up the gearbox oil on a 2004 Vauxhall Combo van, locate the gearbox fill plug, which is typically situated on the side of the gearbox. Use a socket wrench to remove the fill plug, and ensure the vehicle is on a level surface. Use a funnel to add the appropriate type of gearbox oil until it reaches the bottom of the fill hole. Finally, replace the fill plug securely.