Why is using the appropriate oil in a manual transmission important?

Using the appropriate oil in a manual transmission is crucial because it ensures smooth operation and reduces friction. The transmission oil, often referred to as gear oil, is specifically formulated to lubricate the moving parts within the transmission. Proper lubrication allows for efficient movement of gears and associated components, which minimizes wear and tear. When friction is reduced, it not only prolongs the life of the transmission but also enhances shifting performance, making gear changes smoother and more responsive.

Additionally, using the correct oil helps maintain the transmission temperature, allowing it to operate efficiently. If the oil isn't suitable, it could lead to increased friction, overheating, and ultimately result in damage or failure of the transmission, leading to costly repairs. Thus, the right oil is essential for maintaining the overall health and performance of the manual transmission.