Final Answer:
Maintaining the oil level at this point prevents both overfilling and underfilling, ensuring optimal lubrication in a standard transmission. Thus the correct option is c.
Step-by-step explanation:
In a standard transmission with no sight glass, maintaining the oil level exactly even with the fill hole is crucial. This ensures optimal lubrication and functionality of the transmission. The fill hole serves as a reference point, and having the oil level exactly at this point prevents both overfilling and underfilling.
Overfilling can lead to excessive pressure within the transmission, causing leaks and potential damage to seals and gaskets. On the other hand, underfilling may result in insufficient lubrication, leading to increased friction and wear between moving parts. To determine the correct oil level, it's essential to position the vehicle on a level surface and remove the fill plug. If the oil is at the same level as the fill hole, it indicates the right amount of oil in the transmission.
This practice ensures that the gears and bearings are adequately coated with oil, promoting smooth operation and longevity of the transmission components. Regular checks and maintenance are essential to monitor the oil level and address any issues promptly. By adhering to this guideline, vehicle owners can contribute to the overall efficiency and durability of their standard transmissions.