Lubrication systems circulate oil under pressure to minimize friction and wear between moving engine and transmission components. Key parts include oil pumps, filters, pans, and passages integrated within the engine block and cylinder head. Oil pumps maintain consistent pressure, while filters remove contaminants to protect critical surfaces. Modern systems often incorporate variable displacement pumps and remote filter housings for increased efficiency and service intervals. Components are constructed from materials compatible with high temperatures, pressures, and aggressive oil additives, typically including cast aluminum, steel alloys, and synthetic polymers.