Valrust VC-200 is an outstanding preservative oil for enclosed systems, such as engine crankcases, transmissions, hydraulic reservoirs, and cylinders, fuel tanks and gear cases. Valrust VC-200 combines contact protection with vapor phase protection. Thus, surfaces from which the liquid coating has drained, or which are accessible only by vapor contact, continue to be protected from rust and corrosion. A vapor phase corrosion inhibitor diffuses from the liquid throughout an entire enclosed system or area, thereby providing an invisible rust protective coating, even in the presence of moist air or condensate.