Fluids should be matched to the application and to user expectations; stored and dispensed carefully; protected in use; and monitored consistently. Hydraulic oil ranks high among fluids with multi-function capability. True, for sheer utility, it can't match olive oil, which through the centuries has been used as food, lubricant, fuel, medicine, and in religious rites. But, hydraulic oil does serve as an energy-transmission medium, heat-transfer medium, sealant, and lubricant as it powers buckets, blades, and breakers, for example, or propels hydrostatically driven machines, or actuates multi-disc clutches and brakes.
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