PERENNIAL Multipurpose R&O Oil , Multipurpose R&O Oil is a rust and oxidation (R&O)- inhibited, antiwear circulating oil developed for use in circulation systems, centrifugal air compressors, geared turbines, lightly loaded enclosed gear drives and many other industrial applications. It contains a low level of ashless (zinc-free) antiwear additive for mild wear protection. Multipurpose R&O Oil is formulated to provide protection against rust, corrosion and deposit formation, plus mild wear protection. It has good oxidation resistance at high temperatures to minimize sludge and varnish formation, resulting in long service life. It protects system components against rust and corrosion. It has excellent waterseparating properties to minimize the formation of emulsions, and is resistant to excessive foam buildup that can interfere with proper lubrication. An ashless antiwear additive provides mild wear protection to help increase equipment life.