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Are Transmission Fluid and Gear Oil the Same?

2 Answers

VanAdeline

07/29/25 7:36am

Transmission fluid and gear oil are essentially the same, but they are used in different locations, hence the difference in names. More information about transmission fluid and gear oil is as follows: 1. Gear oil is generally used in gear transmission mechanisms such as automotive steering gears, transmissions, and drive axles. It differs from engine oil in terms of usage conditions, composition, and performance. During gear transmission, the surface pressure is high, and gear oil plays an important role in lubricating the gears, providing anti-wear properties, cooling, heat dissipation, corrosion and rust prevention, cleaning, and reducing gear surface impact and noise. 2. Transmission fluid is an oil product used to keep the vehicle's transmission clean, ensuring the normal operation of the transmission and extending the life of the transmission device. It has excellent lubrication effectiveness even at low temperatures and reduces oil loss under harsh operating conditions. Depending on the transmission structure, transmission fluid is further divided into automatic transmission fluid and manual transmission fluid.

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LeIan

08/12/25 10:52am

When I was younger, I always thought transmission fluid and gear oil were the same thing. As a result, using the wrong oil caused my car to shift roughly. In reality, they are not exactly the same. Transmission fluid is specifically designed for automatic or manual transmission systems, providing lubrication, cooling, and containing special additives to handle friction. On the other hand, gear oil is usually thicker and primarily used for differentials or gear lubrication in older manual transmissions. Generally, automatic transmission fluid should not be casually used as gear oil because the additives differ, and mixing them up could damage transmission components. Over time, I learned that choosing the right oil requires checking the car's manual—like my old Ford, which specifies a particular type of transmission fluid. Regularly changing the oil can extend its lifespan and avoid costly repairs like that one time, which is crucial for cost-effective maintenance.

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