In automotive engineering, a sump—commonly referred to as the oil pan—is a metal reservoir bolted to the very bottom of the internal combustion engine crankcase. Its primary mechanical function is to store the engine lubricating oil when the vehicle is turned off and act as a collection basin where oil pools after circulating through moving engine components. An oil pickup tube draws the fluid back out of the sump to lubricate the engine, while a magnetic drain plug at the bottom facilitates periodic oil changes.
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