Layout under a transverse-engined front-wheel-drive car- Engine drain plug Gearbox filler/level plug

The filler plug is on the side of the gearbox and indicates the oil level. There are other plugs on the gearbox so identify it correctly before you unscrew it.

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Checking the gearbox oil level, draining and refilling

A gearbox contains a great many moving parts. Some of them are submerged in oil and some of them...