By adding a thickener to any of the synthetic oils, one creates a grease. A thickening agent serves to retain a film of lubricating oil in proximity to the moving parts thus preventing migration for applications where a constant bath of oil or a reservoir are not practical. Thickening agents come in many forms. Typical examples are: Sodium, Lithium,Teflon, Molybdenum Disulfide, and Clay.
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