SAE 40 Grade Gas Engine Lubricant for stationary equipment. PRO HMGS 40 is formulated to meet the needs of modern 4-stroke gas engines, especially those used at high speeds in cogeneration applications. Manufactured from high quality mineral base oils and a specific additivation ensuring very good protection of engine components with high resistance to oxidation, nitration and good chemical stability. Protects valve seats and valve heads and due to the low ash content improves spark plug performance.