Abstract: An apparatus for extracting lubricating oil from an engine crankcase sump via an oil level dipstick tube associated with the engine and extending to near the bottom of the sump, comprising an oil extraction tube extending downwardly in the dipstick tube for extracting oil from the sump; means sealing off between the extraction tube and the dipstick tube; a sealed container having an inlet port in communication with the extraction tube for flowing extracted oil into the container and having an outlet port above the level of oil in the container; and a vacuum-producing device having an intake port in communication with the outlet port for withdrawing air from the sealed container, creating partial vacuum conditions effective to induce flow of oil into the container; the extraction tube between the dipstick tube and the container being flexible and exposed to indicate vibration as oil mixed with air is passed to the container during the extraction of final amounts of oil from the sump, and to cease vibration whe