Eastman? Turbo Oil 2197 is designed to exceed the demands of current and future jet engines. With over 260 million hours of in-flight experience, it is by far the most widely used HTS fleet oil in the world. Eastman? Turbo Oil 2197 is manufactured in our own facility so you can rely on consistently high quality wherever you are in the world. Eastman? Turbo Oil 2197 is AS5780 HPC / MIL-PRF-23699 HTS class, 5 cSt turbine oil for the most thermally demanding engine and accessory applications.