Is Manual Transmission Fluid Lifetime-Free?

1 Answers
VonRafael
07/30/25 7:41am
No, it should generally be replaced every 3 years or 6 years. The primary function of transmission fluid is to maintain the cleanliness of the gear system and to lubricate the transmission components, thereby extending their service life. Below is relevant information about automotive transmissions: 1. Due to different transmission designs, they are categorized into manual transmissions and automatic transmissions (further divided into CVT, AMT, etc.). Each transmission design has distinct technical requirements. Even the same model of transmission configured in different vehicle models will vary in torque, weight, rotational speed, and structure. 2. Therefore, original manufacturers specify their own dedicated transmission fluids. Manual transmission fluid is commonly referred to as gear oil. Based on its quality level, the American Petroleum Institute classifies automotive gear oils into five grades (GL-1 to GL-5). GL-1 to GL-3 have lower performance requirements and are used for lubricating general-load spur and helical gears, as well as gears in transmissions and steering systems. 3. GL-4 is used for lubrication under conditions of high-speed low-torque and low-speed high-torque, such as in automotive hypoid gear drive shafts and manual transmissions. GL-5 offers the highest performance level and is used for lubricating hypoid gear drive shafts and manual transmissions under severe operating conditions with high shock loads.
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