An oil pan is an essential part of a vehicle's engine, where oil collects and feeds various parts of the engine. However, this part is also known by other names in the auto industry. The most common synonym for oil pan is "sump," which refers to the lowest point in an engine where oil gathers. Another term used for oil pan is "oil sump pan," which accurately describes its function. Less common synonyms for this part include "oil reservoir" and "oil reservoir pan." Regardless of the name, the oil pan is crucial to maintaining proper engine lubrication and preventing damage to various engine components.