My experiance with similair rod end brgs is not fuel linkage, but I would say they NEED to to be lubricated. Oil is not going to stay and will require more frequent application. I would prefer a dry FILM, thus the lubrication with less attaction and retention of dust and contaminates. grease would be the most recomended.
I can't tell from the photo, but the assembly of rod end connections does require a certain amount of consideration to ensure force is transmitted with out binding. I have seen linkage design and sold for mega bucks that required corrections to make it operate proper. I have some good war stories about such.
and back to your original query...Dry is bad unless the rod ends are pre lubricated with a dry film coating or either the ball or race is made from a low friction material. the steel on steel or steel on brass would benifit from a perodic lube
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