US Patent 7163085 Apparatus for draining used engine oil

An apparatus for removing spent oil from an internal combustion engine and purging at least a portion of oil retained in an associated oil filter via air actuated valves in communication with a source of pressurized air. The apparatus has a waste receptacle and a venturi communicating with the waste receptacle for creating a vacuum therein. The air actuated valves include a timer to introduce the pressurized air to the oil filter for a predetermined amount of time to purge a portion of the spent oil in the oil filter into the internal lubrication distribution passage system.