Abstract: A lubrication system for the plunger of a die cast machine is disclosed that does not require a timing mechanism or an additional pressure source for the lubricant. The forward stroke of a lube piston is used to force lubricant out of a lubrication chamber in the plunger through a passageway to the outer surface of the plunger by decreasing the volume of the lubrication chamber. A spring within the plunger's lubrication chamber is used to retract the piston and thereby increase the volume of the lubrication chamber. The relatively low pressure during this retraction stroke allows lubricant to flow from a lubricant tank into the lubrication chamber for distribution during the next forward stroke of the plunger.