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This high-temperature bearing grease is designed for electric motors to prevent overheating and excessive wear on fast-moving elements in operational temperatures of 300°F or greater. They are used in high-speed electric motors for pumps, fans, and conveyors.
https://www.grainger.com/product/MOBIL-Electric-Motor-Grease-Polyrex-5XB54?searchQuery=5XB54&searchBar=true