Castrol Hyspin 4243 is a zinc-free detergent hydraulic oil (type HLP-D), based on high quality base oils and selected additives. This hydraulic oil has detergency / dispersing properties which retains impurities in solution avoiding deposits and adhesions in the system which can cause interference in control systems. Corrosion is avoided through the high moisture absorption propensity and it also reduces wear in boundary lubrication area.