How do you change gear oil in a corsa?

To change the gear oil in a Vauxhall Corsa, first, ensure the vehicle is on a level surface and safely raised. Remove the fill plug on the transmission case, then drain the old oil by removing the drain plug and letting it flow into a container. Once drained, replace the drain plug securely, and refill with new gear oil through the fill plug until it reaches the proper level. Finally, replace the fill plug and check for any leaks.