Its primary role is to transfer power from the engine to the transmission gears while simultaneously providing lubrication to clutches, bands, and planetary gearsets. How to Determine the Correct Fluid Never assume that the fluid used in one system is identical to another.
Can I Use ATF Instead Power Steering Fluid: Understanding the Differences
Unlike simple hydraulic oil, ATF must maintain consistent viscosity across a wide temperature range and resist thermal breakdown caused by the intense heat generated within the torque converter. If a vehicle requires a specific low-viscosity, non-foaming fluid and ATF is used instead, the most common result is aeration or foaming.
However, this is not a universal rule. Substituting these specialized fluids with ATF can cause seals to swell or degrade, leading to system failure.
Can I Use ATF Instead Power Steering Fluid and Potential Risks
Summary and Best Practices. Because power steering systems operate at relatively low pressures and ambient temperatures, the fluid does not require the same level of thermal stability or anti-wear additives designed for the clutch packs inside a transmission.
More About Can you use automatic transmission fluid for power steering fluid
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