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Hydraulic oil and hydraulic fluid are terms that are sometimes used interchangeably, but they are not necessarily the same. While hydraulic oil is a fluid, hydraulic fluid can also consist of other fluids, including plain water, water-oil emulsions and salt solutions.
Hydraulic oil consists of oils and additives designed to transmit power while acting as a lubricant and coolant. The oil is effective in a wide range of temperatures and reduces wear, rust and corrosion in equipment used in industries like agriculture, mining and construction.