This fluid must meet specific criteria regarding viscosity and foaming characteristics to ensure immediate response and precise feedback. If you are unsure, purchasing a small bottle of the manufacturer-recommended fluid is always the safer and cheaper option compared to repairing a damaged power steering pump or transmission control module.
Power Steering Fluid Substitute ATF Warning: Understanding the Risks
Foam compresses, leading to a spongy steering feel, loss of hydraulic pressure, and potentially complete failure of the power assist. Furthermore, the additives in ATF are designed to handle high torque and friction, which can cause excessive foaming in the relatively gentle power steering pump.
In these cases, using the correct ATF is not only acceptable but recommended by manufacturers. If a vehicle requires a specific low-viscosity, non-foaming fluid and ATF is used instead, the most common result is aeration or foaming.
Power Steering Fluid Substitute ATF Warning: Why It's Risky
The key difference lies in the friction modifiers; power steering fluid is formulated to provide a slippery, consistent feel for the driver, whereas transmission fluid is designed to grip and hold to engage gears securely. Its sole purpose is to transmit force from the steering gear actuator to the wheels, reducing the physical effort required to turn the steering wheel.
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