How do you check gear box oil level in opel corsa 1.4 gsi?

To check the gearbox oil level in an Opel Corsa 1.4 GSi, first ensure the vehicle is on a level surface. Locate the gearbox's filler plug, usually found on the side of the gearbox casing. Remove the plug; the oil level should be just below the opening. If oil seeps out when the plug is removed, the level is correct; if not, you may need to add oil until it reaches the proper level.