The red line is a traditional fluid, and the green line is a higher VI optimised fluid. The flatter the line the wider the optimised viscosity range.


The cost of the fluid may be higher at the outset, but it has been calculated that efficiency could be improved by up to 28% and running costs could be improved by up to 2.7% in mobile equipment and 8.5% in stationary equipment.1


In an age where every penny counts, introducing a multigrade hydraulic fluid is worth serious consideration, as it will maximise the efficiency of your system and could reduce the running costs significantly.


Figure 2: Viscosity Index Graph demonstrating an optimised viscosity to temperature position.


When this is translated into the original efficiency graph, the effect is that the volumetric curve and mechanical curve come closer together and ultimately the optimised operating zone now becomes wider, giving the operator more efficiency over a wider temperature range. See Figure 3.


Creating a multigrade hydraulic fluid is quite simple but is more costly than the monograde equivalent. Introducing a polymeric viscosity modifier and adjusting your base oil mix will allow the creation of a multigrade ISO 32/46/68 depending on what is needed for the equipment.


Figure 3: Optimised Viscosity to Efficiency Relationship Graph.


www.imcdgroup.com/en/business-groups/ lubricants-and-energy


1 https://360.lubrizol.com/2021/Energy-Efficiency-for-Hydraulic-Systems


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