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Is Automotive Gear Oil the Same as Transmission Oil?

2 Answers

Geraldine

07/25/25 6:31am

Automotive gear oil is indeed transmission oil, which is a type of high-viscosity lubricant specifically designed to protect power transmission components. It has a strong sulfurous pungent odor and is also known as transmission lubricating oil. Gear oil is primarily composed of antioxidants, antifoaming agents, and rust inhibitors. The functions of gear oil include: 1. Lubricating the transmission system: It reduces wear on gears and other moving parts, ensures the normal operation of the transmission system, extends service life, minimizes friction and power loss in gear transmission, and improves mechanical efficiency. 2. Cooling transmission components: Gear transmission generates significant heat due to friction at the tooth contact surfaces, leading to localized high temperatures. Gear oil continuously dissipates this heat during circulation, releasing it through the air and the transmission housing to maintain proper functioning of the transmission components. 3. Preventing corrosion and rust: It reduces impact and noise at the gear surfaces and continuously cleans away contaminants and solid particles deposited on the gear surfaces.

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VonCecilia

08/10/25 6:09pm

I'm an auto mechanic, and this is a common confusion among car owners. Gear oil is a broad category, and transmission oil is a specially formulated type within it. ATF (Automatic Transmission Fluid) used in automatic transmissions needs to balance both hydraulic transmission and gear lubrication, while MTF (Manual Transmission Fluid) for manual transmissions focuses more on anti-wear and heat dissipation. The oil used in the rear axle differential is called pure gear oil, which has higher viscosity. When buying oil, make sure to check for GL-4 or GL-5 standards—mixing them can corrode the synchronizers. Last time, a customer tried to save money by adding GL-5 oil to their automatic transmission, and within three months, they experienced rough shifting. When we opened it up, we found all the copper bushings completely corroded.

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