sump

1. sump Noun. (automotive) The crankcase or oil reservoir of an internal combustion engine.
crankcase
1. Noun. the part of an engine that contains the crankshaft
reservoir
1. Noun. A place where anything is kept in store; especially, a place where water is collected and kept for use when wanted, as to supply a fountain, a canal, or a city by means of aqueducts.
2. Noun. A small intercellular space, often containing resin, essential oil, or some other secreted matter.
3. Noun. A supply or source of something.
internal combustion engine
1. Noun. A piston or a rotary heat engine directly powered by the products of intermittent combustion of a fuel.
2. Noun. A heat engine in which intermittent or the continuous burning of a fuel takes place inside a combustion chamber; the resulting pressurized gas acts directly on the engine to do useful work, such as a piston engine, gas turbine, jet engine or rocket.[http://www.google.com/url?sa=t&ct=res&cd=1&url=http%3A%2F%2Fwww.britannica.com%2Feb%2Farticle-9106036%2Finternal-combustion-engine&ei=ZdJqSMCnDo_o0gXitpynDA&usg=AFQjCNE6h_t0H7XJLKnUjudcNQjmgMeUdg&sig2=srdZ