Abstract: A liquid dispensing device particularly suitable for automatically dispensing a lubricant to the combustion zones of an internal combustion engine. A sealed lubricant reservoir conjoins with an air and liquid blending chamber formed by a housing. The housing is sealed save for a minute air bleed aperture. An inlet to the chamber for the liquid is provided in an upper part of the housing and an outlet from the chamber provided in a lower part of the housing. The outlet is set up higher than a lower extremity of the chamber such that the outlet operates as a weir. The outlet conjoins with a turbulating device comprised of an axially adjustable pin having an external helical groove. The pin is mounted in a bore conjoining with a conduit to a required dispensing port, for example, in an inlet manifold of an engine. Inlet manifold vacuum draws lubricant from the reservoir via the air with lubricant blending chamber and the turbulating device.