Which of the following items would most likely be included in a comprehensive maintenance service?

In the context of a comprehensive maintenance service, checking the transmission fluid is a fundamental task that is essential for the smooth operation and longevity of a vehicle. Transmission fluid plays a crucial role in lubricating the gears and components within the transmission, ensuring proper shifting, and maintaining the overall performance of the vehicle. Regular checks of the transmission fluid level and condition help in early detection of potential issues such as leaks or contamination, which can lead to significant and costly repairs if not addressed promptly.

In contrast, while changing the windshield wiper blades and inspecting belt drives are important maintenance tasks, they typically do not encompass the broader scope implied by a comprehensive maintenance service. Replacing the rear main seal is a more extensive and specialized repair rather than a routine maintenance task, generally performed only when specific symptoms or issues arise. Comprehensive maintenance is focused on preventive measures, and checking transmission fluid clearly aligns with that goal, as it helps ensure the vehicle operates reliably over time.