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Are Power Steering Fluid and Transmission Fluid Interchangeable?

2 Answers

DiTucker

07/25/25 2:11am

Power steering fluid and transmission fluid are not interchangeable. Power steering fluid is a type of hydraulic fluid designed to transmit assistive force, so it has low viscosity and high fluidity requirements. Transmission fluid, on the other hand, is a gear oil that serves the functions of lubrication, cooling, and cleaning, thus requiring high viscosity and low fluidity. These are two entirely different types of fluids and cannot be used interchangeably. Power steering fluid has low viscosity: It has high fluidity, whereas transmission fluid has high viscosity and low fluidity. Two different fluids: Power steering fluid and transmission fluid are actually two distinct types of fluids. Their differing functions and purposes result in variations in fluidity and viscosity. The role of transmission fluid: From an operational standpoint, transmission fluid not only provides lubrication but also transmits force. Due to significant temperature fluctuations during operation, it often experiences higher temperatures than the maximum operating temperature of engine oil. This necessitates the use of higher-quality additives to support machine performance.

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SamuelMarie

08/10/25 4:26pm

I've seen many car owners take the easy way out by pouring transmission fluid into the power steering system, only to find the power steering pump burnt out during repairs. These two fluids really can't be mixed. Power steering fluid must withstand the high-pressure impacts of the steering gear and protect rubber seals from corrosion, while transmission fluid focuses on precise friction coefficient control to ensure smooth clutch engagement. It's like forcing diesel into a gasoline car—it might run fine in the short term, but the piston rings will eventually fail. Now I always supervise mechanics to use OEM-specified fluids during maintenance—after all, replacing a power steering system costs thousands.

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