Which of the following is a typical cause of manual transmission failure?

Inadequate lubrication is a typical cause of manual transmission failure because the transmission relies heavily on proper lubrication to function smoothly. Lubrication serves several critical purposes: it reduces friction between the moving parts, dissipates heat generated during operation, and helps to prevent wear and tear on components. When the lubricant level is low, or if the lubricant is contaminated or degraded, it can lead to increased friction, overheating, and eventually the failure of gears and bearings within the transmission. Regular maintenance, including checking and changing the transmission fluid at recommended intervals, is essential to ensure the longevity and performance of a manual transmission.