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In a power steering system, the power steering fluid does most of the work, once it is taken from the reservoir and enters the cylinder in the hydraulic steering system where it is pressurized. While Zoro carries many brands of power steering fluid, the job of all of them is to perform well under pressure while helping to stop squeaks and leaks, as well as to prevent corrosion, oxidation and wear. Items vary by compatibility, size and other considerations. For more on automotive fluids, see our additives and protectants and motor oils.