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Is There a Difference Between Transmission Fluid and Engine Oil?

2 Answers

VanSadie

07/29/25 5:32am

Transmission fluid and engine oil are different. The following are the differences between transmission fluid and engine oil: 1. Different environments: Transmission fluid, as the name suggests, is a type of transmission lubricant used in transmissions, designed for lubricating various gears in the gearbox, reducer, and differential, operating in relatively low-temperature environments. Engine oil, or engine lubricant, is used inside the engine to lubricate internal components, enduring long-term high-temperature and high-pressure conditions, requiring higher oxidation resistance and stronger shear resistance. 2. Different functions: Both have lubricating effects. Transmission fluid prevents gear surface wear, sintering, and other phenomena, extending service life and improving power transmission efficiency. Engine oil cleans, lubricates, and cools the engine's interior. 3. Different properties: Engine oil is weakly alkaline, while transmission fluid is strongly alkaline. Using engine oil as a substitute for transmission fluid can lead to gear degradation and poor transmission, including reduced wear resistance in the gear system and transmission. Conversely, using transmission fluid as a substitute for engine oil fails to provide effective cooling under the engine's fluctuating high and low temperatures and cannot meet the viscosity requirements of engine oil.

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DeEthan

08/12/25 9:06am

I've been driving for over twenty years and often get asked this question. Transmission fluid and engine oil are really completely different. Transmission fluid is specifically used in the gearbox, where there are many gears and high friction, so the oil needs to be thicker to protect the gears and prevent slipping. Engine oil, on the other hand, lubricates the pistons and bearings inside the engine, has better fluidity, and also has a cleaning function. If you add engine oil to the transmission, the oil will be too thin, causing gear wear, overheating, rough shifting, and even total transmission failure, leading to expensive repairs. I have a relative who made this mistake and ended up replacing the entire transmission, costing over 8,000 yuan. So during maintenance, always change the fluids separately—transmission fluid every 40,000 to 60,000 kilometers and engine oil every 5,000 to 10,000 kilometers, and make sure to check the vehicle manual for the correct specifications.

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