A gravity oiler assembly for for passively managing a fluid within an input fluid reservoir for use in an equipment fluid reservoir. The gravity oiler assembly comprises a fitting, the input fluid reservoir, and a nozzle. The fitting comprises an outer surface, an inner cavity, a top aperture, and a side aperture. The input fluid reservoir comprises a bottle being arranged with a fluid passage attached to the nozzle. The nozzle is arranged below the input fluid reservoir and inserted into the top aperture of the fitting. The gravity oiler assembly is configured to allow the fluid in the input fluid reservoir to enter a portion of the nozzle, the inner cavity and the side aperture. The gravity oiler assembly is configured to store the fluid in the input fluid reservoir and passively dispense the fluid into an equipment fluid cavity of the equipment fluid reservoir.