Final answer:
It is generally recommended to check fluids and other components under the hood of a car at least once a month, or as specified by the vehicle's owner manual, especially before long trips for safety and reliability.
Step-by-step explanation:
A motor vehicle service or tune-up is a series of maintenance procedures carried out at a set time interval or after the vehicle has traveled a certain distance. The service intervals are specified by the vehicle manufacturer in a service schedule and some modern cars display the due date for the next service electronically on the instrument panel. Under normal driving conditions, it is recommended to perform checks under the hood at regular intervals. A typical recommendation is to check the engine oil, coolant levels, brake fluid, power steering fluid, and windshield washer fluid at least once a month.
However, one should also refer to the vehicle's owner manual for specific guidelines as some newer vehicles with advanced electronic systems may require less frequent checks. Additionally, before going on a long trip, it is prudent to conduct a thorough inspection of the vehicle, including under the hood, to ensure safety and reliability on the road.