Used in petroleum and synthetic lubricants as a multifunctional rust and corrosion inhibitor. VANLUBE 704S is a synergistic blend of polar additives capable of forming films or complexes on metal surfaces; particularly copper and copper alloys that might be exposed to free sulfur or active sulfur compounds. It is used in a variety of lubricants based on petroleum oils or synthetics. Economical concentrations enhance antioxidants by passivating catalytic metal surfaces in the lubricant system.