AeroShell Oil Turbine 500 is a 5 centistoke synthetic lubricating oil for gas turbine engines. It is a careful blend of "hindered" esters and modern additive technology. AeroShell Oil Turbine 500 provides superior high temperature corrosion protection and excellent anti-wear protection. It is blended to have superior thermal and oxidation performance in critical turbine applications. AeroShell Oil Turbine 500 meets all the requirements and is qualified under US Military specification MIL-PRF-23699F Class STD. It is also approved commercially for use in a wide range of turbine engines as well as the majority of accessories. Always check with the manufacturer for the exact recommendation for each application.