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