Abstract: A rod oiler assembly for oiling the piston rod of a cylinder assembly which presents a surface against which a lubricant impregnated material is retained by a removable housing. The lubricant-presenting member surrounds the piston rod and lubricates the rod when the rod moves relative to the cylinder itself, and thus rust and dirt and the like are combated by normal extension and contraction of the rod. The oiler assembly housing or retainer member presents a pocket in which the lubricant member is retained, and it has openings therein which are of various radial locations and which receive fasteners or pins for assembling the oiler to the end surface of a cylinder assembly. The lubricant member and the retainer member are arranged to be capable of opening so that they can move over the piston rod and then be positioned endlessly therearound, and the fasteners or pins extend through the retainer member and into openings or other arrangements with the cylinder assembly.