Are all hydraulic oils the same?

 Hydraulic systems form the base of many machines, from agricultural tractors and construction equipment to aircraft and industrial press systems. Although these systems might differ in terms of size and complexity, they all depend on a crucial element that is hydraulic oil. At first glance, hydraulic oils might seem interchangeable--after all, they're all designed to transmit power through fluid. But the truth is that the different hydraulic oils may not be the same. Choosing the wrong one could cause inadequate performance, higher wear, or even catastrophic failure  

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