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An Oil Pump is also known as an internal combustion machine. Oil Pump is generally gears or gear types that are driven by the cam shaft or the crank shaft or a rotor type. Oil pressure varies to a great extent when they are operated with a lower temperature and a higher RPM OR Revolutions per Minute which increases the Pump pressure up to a maximum of about 4 bars. Oil Well refers to a boring that is made through the earth's surface to produce or find hydro carbons or petroleum, along with some natural gas produced. To ensure that the pressure does not go beyond the rated maximum, there is a spring adjusted pressure relief valve that directs the oil back to its source once the preset limit of the pressure is exceeded.