Because clutches use changes in friction to modulate the transfer of torque between engine & transmission, they are subject to wear in everyday use. An excellent clutch, when used by an specialist driver, can last hundreds of thousands of kilometres (or miles). Weak clutches, abrupt downshifting, inexperienced drivers, & aggressive driving can lead to more frequent repair or replacement.
Manual transmissions are oiled with gear oil or engine oil in some cars, which must be changed periodically in some cars, although not as often as the automatic transmission liquid in a vehicle so equipped. (Some manufacturers specify that changing the gear oil is seldom necessary except after transmission work or to rectify a leak.)
Gear oil has a characteristic aroma due to the addition of sulfur-bearing anti-wear compounds. These compounds are used to reduce the high sliding friction by the spiral gear cut of the teeth (this cut eliminates the characteristic whine of straight cut spur gears). On motorcycles with "wet" clutches (clutch is bathed in engine oil), there is usually nothing separating the lower part of the engine from the transmission, so the same oil lubricates both the engine & transmission. The original Mini placed the gearbox in the oil sump below the engine, thus using the same oil for both. The clutch was however a conventional dry plate clutch.
Manual transmissions are oiled with gear oil or engine oil in some cars, which must be changed periodically in some cars, although not as often as the automatic transmission liquid in a vehicle so equipped. (Some manufacturers specify that changing the gear oil is seldom necessary except after transmission work or to rectify a leak.)
Gear oil has a characteristic aroma due to the addition of sulfur-bearing anti-wear compounds. These compounds are used to reduce the high sliding friction by the spiral gear cut of the teeth (this cut eliminates the characteristic whine of straight cut spur gears). On motorcycles with "wet" clutches (clutch is bathed in engine oil), there is usually nothing separating the lower part of the engine from the transmission, so the same oil lubricates both the engine & transmission. The original Mini placed the gearbox in the oil sump below the engine, thus using the same oil for both. The clutch was however a conventional dry plate clutch.
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