Is Gearbox Oil the Same as Transmission Fluid?

1 Answers
SpencerFitz
07/30/25 6:43am
Gearbox oil is not the same as transmission fluid. Below are detailed explanations of the two: 1. Gearbox oil is a lubricant used to maintain the cleanliness of the gear shift system, providing lubrication to extend the lifespan of the transmission components. It offers effective lubrication even in low-temperature conditions and reduces oil loss under harsh operating conditions. Gearbox oil is added to the transmission; without it, the internal gears would experience dry friction, leading to wear and tear. Both automatic and manual transmissions require gearbox oil. 2. Transmission fluid is specifically designed for automatic transmissions. In the early days, automatic transmissions did not have dedicated fluid and instead used engine oil. Due to significant differences in operating conditions and technical requirements, the practice of using engine oil as transmission fluid was quickly phased out. Today's transmission fluid serves both as the hydraulic fluid for the torque converter and as the lubricant for the planetary gear structure and the hydraulic fluid for the shifting mechanism.
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