ABSTRACT
Hydraulic fluids are primarily petroleum-based fluids used as a power transfer medium in industrial hydraulic system and are generally lighter viscosity that most mineral oils, found offered in the 32 to 150 cSt @ 40 viscosity range. Although, technically, water can be uses as a hydraulic fluid, the majority of hydraulic fluid is formulated from Group 1 mineral base oil stocks. However, in a high temperature operating environment
