Built on more than 50 years of experience with industryleading products, Eastman Turbo Oil 2197 (ETO 2197) is designed to exceed the demands of current and future jet engines. ETO 2197 is the oil of choice for airlines operating their fleets on HPC oils, with approximately 450 million engine/accessory hours of proven and trusted performance. It was the first oil approved to AS5780A specification and exceeds all the requirements of AS5780 HPC Class. Approved by all leading engine manufacturers, ETO 2197 is qualified to MIL-PRF-23699 High Thermal Stability (HTS) class and is by far the most widely used HTS fleet oil in the world. It is used and trusted by engine OEMs when certifying engines with high thermal stress loads.