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Stand the car on level ground before you check the gearbox oil level. If you have to add a lot to correct the level, check carefully for leaks (See ). The gearbox oil level should not drop noticeably between routine oil changes about every 30,000 miles (50,000 km).

'Extreme pressure' additives in some gearbox oils act as solid lubricants on gear teeth when temperature rises above the safe limit of ordinary oils. As in the, the oil must be able to withstand high temperatures. The type of oil used depends partly on the type of gears the manufacturer has designed into the gearbox. The lubrication is designed to prevent metal-to-metal contact, between teeth on gears, for example. Some of them are submerged in oil and some of them are splashed - that is, the oil is carried to them by other moving parts. A gearbox contains a great many moving parts. There are other plugs on the gearbox so identify it correctly before you unscrew it. The filler plug is on the side of the gearbox and indicates the oil level.