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Viscosity can be altered greatly by temperature which is why when viscosity is quoted its temperature is detailed after the viscosity. Some liquids such as oils viscosity can alter wildly between a few cst and 1500cst. Positive displacement pumps prefer thicker fluids as they can achieve higher flow rates and pressures than they can with low viscosity liquids as in positive displacement pumps the liquids will sometimes recirculate within the pump head known as slip.