Servo SYSTEM FF 46, a hydraulic oil of ISO VG 46 grade is way superior than its counter product System 46. Hydraulic oils, also known as hydraulic fluids, are either based on minerals or synthetics and demonstrate the quality of non-compressibility which enables the transfer of power across the machine components. What makes this hydraulic oil special is that is operational in all types of weather conditions, thus making it the consumer choice at places where harsh conditions persist. ISO VG 46 grade means that this oil possesses viscosity ranging from 41.4 and 50.6 centistokes at the temperature of 40 deg C.