An oil injector for introducing a measured quantity of lubricating oil into a predetermined quantity of gasoline for use with a two-cycle engine. The oil injector includes a tank for a supply of lubricating oil and a reciprocating pump disposed internally of the oil tank and provided with a handle located externally of the oil tank for manual manipulation with the pump being provided with a calibrated chamber to inject a predetermined quantity of lubricating oil into the gasoline supply for a two-cycle engine for each reciprocal movement of the pump piston. The oil injector is conveniently mounted alongside of or adjacent to the gasoline supply tank so that when gasoline is added to the gasoline tank, an appropriate quantity of lubricating oil may be injected into the gasoline tank by use of the oil injector, thus rendering the device especially useful for mounting on a vehicle having a two-cycle gasoline engine thereon, such as motor powered cycles, "mopeds" and the like or other vehicles and machines such as snowmobiles, lawn mowers, outboard motors, chain saws, and the like.
