A self-lubricating king pin joint system has a bushing within a knuckle, with a hollow king pin positioned through a center of the bushing, thereby forming a king pin joint between the bushing and the king pin. A controllable spring is positioned in and near the center of the hollow interior of the king pin, where upper and lower pistons are positioned on opposite ends of the spring. An upper volume of lubricant is placed on the upper side of the upper piston and a lower volume of lubricant is placed on the lower side of the lower piston. A drive mechanism separately controls an extension of the spring in both upper and lower axial directions, so as to individually extend each piston to self-meter lubricant over time/miles and at prescribed intervals. Thereby, each piston separately lubricates respective portions of the king pin joint.