oil pan

noun
the bottom part of the crankcase of an internal-combustion engine in which the oil used to lubricate the engine accumulates.

Origin:
1905–10

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Position a catch tub under the oil pan and unscrew the drain plug.
Cleans and inspects existing engine parts such as valve cover, oil pan, and
  fuel rack using parts washer.
It is always a good idea to use an oil pan when working on your vehicle to
  prevent accidental spills.
The oil is drained from the car and the oil pan is removed.
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