What potential cause of vibration in a car turning could Tech A assert regarding limited slip differentials?

The assertion regarding the cause of vibration in a car turning being related to wrong lubricant in a limited slip differential is valid because the type of lubricant used is crucial for the proper functioning of the differential. Limited slip differentials require specific lubricants that provide sufficient frictional properties to allow for the appropriate transfer of torque between the wheels. If the incorrect lubricant is used, it can lead to failures in the differential's operation, such as improper engagement of the clutch pack, which could cause vibrations during turns. This issue can manifest when the differential's friction modifiers do not perform as needed, leading to an inconsistency in wheel rotation and resulting vibrations.

In contrast, while other factors like overfilled differential oil, excessive tire wear, and faulty wheel alignment could certainly contribute to vibrations, they are not as directly linked to the specific function of a limited slip differential as the choice regarding the lubricant is.