HD 40 / SAE 40 Engine Oils are premium monograde oils that are engineered for greater protection against thermal breakdown. AWS Series are high performance hydraulic oil. GATEWAY AWS Series manufactured from premium Base oils and is fortified with an additive system to provide a product which insures maximum Performance in all aspects of hydraulic service. GATEWAY AWS Series provide excellent anti-wear agents Keep wear rates low on critical pump parts and rust and corrosion problems are eliminated by the rust Inhibitor. A foam suppression additive eliminates concerns over operating problem