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

The typical layout has the gearbox behind the engine and beneath the floor. Some gearboxes have a dipstick instead of the usual filler-and-level plug. Normally you reach the plug from beneath the car. Clean round the area before removing the plug, to avoid letting dirt in the hole.

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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...