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HYDRAULIC HVI OILgrades are a range of specialist premium quality, very high viscosity index multigrade hydraulic fluids. The economical operation of a hydraulic system is dependent on the correct hydraulic oil being used. HYDRAULIC HVI OILrange of hydraulic fluids is manufactured from highly refined base oils which have good oxidation resistance, lowering the possibility of gums and lacquers. They are blended using carefully selected additives and special viscosity index improvers which offer superior viscosity/temperature characteristics. They can be used where extremes of ambient temperatures are encountered.