Q: What maintenance do I need to perform on my rod ends and spherical bearings to keep them operating properly?
A: For metal-to-metal rod ends and spherical bearings, a thin layer of grease applied occasionally to ball outside diameter will assist in extending the life of these products. Rod ends and spherical bearings that are Teflon lined are self-lubricating and are designed to be maintenance free and should not be lubricated.
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http://www.aurorabearing.com/technical-faqs.htmlPersonally I stay away from grease simply because it picks up dirt and grime very readily. I like things like LPS-2 or Wurth HHS-K. Note that LPS-2 is indicated by the manufacturer for "indoor" use.