What is one consequence of improper lubrication in a manual transmission?

Improper lubrication in a manual transmission leads to increased friction and wear within the system, making this the correct answer. Lubricants in a manual transmission serve to minimize friction between moving parts, such as gears and bearings, allowing them to operate smoothly. When lubrication is inadequate or improperly applied, friction increases, which can lead to overheating and accelerated wear of the internal components.

The consequences of increased friction include potential gear grinding during shifts, noisy operation, and ultimately, failure of transmission components. The longevity and performance of the transmission can be significantly compromised, resulting in costly repairs or the need for a complete rebuild if left unaddressed.

In contrast, enhanced shifting performance, reduced engine wear, and improved fuel economy all rely on proper lubrication to function effectively and are not outcomes of insufficient lubrication.