Manual Transmission Oil

Transmission oil, also called gear oil, lubricates, cleans, and cools manual transmissions. It cleans out particulate matter from within your transmission and helps to keep it from overheating. Old or degraded transmission oil doesn’t do this as well, so as your oil gets old, it needs to be changed. Transmission oil has a peculiar smell because it contains sulfur-bearing anti-wear compounds. These compounds help to minimize high-sliding friction by the helical gear cut of the teeth. Many motorcycles have clutches bathed in transmission oil because there’s often no separation of the lower engine and the transmission, so the same oil lubricates both the engine and transmission.