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The fluid specification used for polished surfaces is indeed MIL-PRF-83282. This specification pertains to a type of hydraulic fluid that is designed to minimize wear and maintain the performance of hydraulic systems in various military aircraft and equipment. The fluids under this specification are formulated for excellent lubrication properties, thermal stability, and compatibility with a range of materials found in aircraft systems, making them ideal for maintaining the integrity and appearance of polished surfaces.

The reason this specification is crucial for polished surfaces lies in its ability to provide a protective barrier against contaminants while ensuring that the smoothness and luster of the surface are preserved during operations. In contrast, the other specifications listed serve different purposes or applications, such as general-purpose hydraulic fluids or those intended for non-polished surfaces, thus making them less suitable for the specific requirement of maintaining polished surfaces.