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In all of our machines, the oil is the hydraulic fluid used in the hydraulic pumping unit to operate the machine. It is certainly not petrol, but is more than just a lubricant. Although it naturally provides lubrication, its main function is to transfer power from the pumping unit to the machine. The pumping unit pressurizes the oil (i.e. creates hydraulic ‘energy’) and moves it to the hydraulic cylinder in the machine; the hydraulic cylinder converts this hydraulic energy into mechanical motion.