What is a oil sump?

An oil sump is a reservoir or chamber in an engine that holds the engine oil, allowing it to collect and circulate for lubrication. It typically sits at the bottom of the engine and is crucial for maintaining proper oil levels and ensuring that the oil can be pumped through the engine components. The sump also serves to cool the oil and can help in filtering out contaminants. In some engines, it may be part of the oil pan, which is designed to be easily accessible for oil changes.