Bottom of a crankcase

OILPAN

["\"Engine's liquid holder below\""]

The clue "Bottom of a crankcase" leads to the answer "OILPAN" through a straightforward definition. A crankcase is an essential part of an engine that contains the crankshaft. The "bottom of a crankcase" typically refers to the oil pan, which is the reservoir that holds the engine oil. Therefore, the clue directly points to the answer "OILPAN" by describing its function and location within the engine.