Does your fleet travel across a range of temperatures? Eastman Turbo Oil 2389? offers best-in-class thermal stability for more reliable performance across a range of temperatures. It is your advanced APU performance oil with excellent “cold soak” reliability in aircraft APUs. Due to its good oxidation stability, you can see improved fluid life in your engine. ETO 2389 is the most widely used 3 cSt synthetic lubricant in aircraft APUs, so you won’t be the first to switch.