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The correct answer focuses on the fact that the fluid used in a vehicle's power steering system can indeed vary by application. This means that different vehicles or even different models from the same manufacturer might require distinct types of power steering fluid due to variations in design, materials used, or the specific system configurations.
For instance, some systems may utilize ATF (Automatic Transmission Fluid), while others might require dedicated power steering fluid that has specific additive packages for optimal performance. This differentiation ensures that the fluid operates effectively under the conditions presented by each unique power steering system, providing the necessary lubrication, protection against wear, and hydraulic efficiency.
Understanding that the requirements can differ significantly makes it crucial to refer to the specific application, which aligns with the correct answer. Each vehicle may have distinct characteristics and operational demands that dictate the choice of fluid, hence the emphasis on application variability.