Abstract: An apparatus for draining oil from an engine. The apparatus includes an engine having an engine housing, crankshaft, a piston, and an oil reservoir, an engine starting mechanism configured to engage the crankshaft and piston, a check valve configured to prevent pressure in a crankcase from escaping and configured to allow filtered air into the engine, and a selector valve configured to open a flow path between the check valve and a vent so oil can be drained.

Abstract: The engine/transmission assembly includes a first chamber, a second chamber, and a fill hole that fluidly communicates with the first chamber. The first chamber is capable of containing lubricant at a first level, and the second chamber is capable of containing lubricant at a second level. The engine/transmission assembly also includes an opening that is between the first and second chamber and that fluidly communicates with the first and second chamber. The opening is positioned to maintain the first level in the first chamber and raise the second level in the second chamber when lubricant is added to the first chamber through the fill hole, and to maintain these two levels when the engine is running.