Apparatus for recycling engine lubricating oil

Claim 1

Equipment for draining and refilling the lubricating oil sump of a motor vehicle, such equipment comprising a main oil reservoir with a capacity substantially greater than that of the sump, oil inlet means including a hose line and an inlet pipe for connecting the interior of the sump to the reservoir, and an oil collecting vessel having an inlet and an outlet and being of greater capacity then said sump but less then said reservoir interposed in said oil inlet means, valve means communicating with the inlet and the outlet of said oil collecting vessel, means for reducing and increasing air pressure in the oil collecting vessel, said last named means upon reducing air pressure causing said inlet valve to open causing oil to flow through said hose line and inlet pipe into said oil collecting vessel while preventing flow from said collecting vessel to said reservoir and upon increasing air pressure in said oil collecting vessel to cause oil to flow through said outlet pipe into said reservoir while closing the valve means communicating with the oil inlet of said vessel, oil outlet means communicating with said reservoir and connecting with said reservoir and connecting said reservoir to the vehicle sump and metered oil discharge means for causing metered doses of oil from the reservoir to flow through the oil outlet means.