Renato.
If "wd, d" means WD40 you would be better served by an ordinary mineral oil. WD40 is evil muck that dries to a sticky gummy coating that could make the problem worse.
For those who do not know, WD40 is the 40th water displacement formulation that was tested in the search for a coating that would protect steel against rust. It serves that purpose very well but it is not, and was never intended to be, a lubricant.