Castrol Hyspin™ Spindle Oil range is based upon highly refined mineral oil enhanced with rust and oxidation inhibitors and formulated especially for the lubrication of high speed and precision machine tool spindle bearings.Castrol Hyspin Spindle Oils have been specially formulated to provide outstanding protection against rust and oxidation while demonstrating good lubricity. These types of oils are also referred to as "R and O" oils. Castrol Hyspin Spindle Oils are designed for use in all types of spindle bearings, including high-speed spindle bearings. Spindle E5 has an additional oiliness agent for enhanced lubricity. Castrol Hyspin Spindle Oils are fully compatible with elastomer materials commonly used for static and dynamic seals, such as nitrile, silicone and fluorinated (e.g. Viton) polymers.