Eastman Turbo Oil 25

Eastman Turbo Oil 25 is a high load-carrying gas turbine oil for demanding gear applications. It is a DOD-PRF-85734, 5 cSt viscosity class oil with extreme pressure (EP) additives for the demanding loads of helicopter gearboxes. Formulated from synthetic base stocks and advanced additives, it combines the thermal and oxidation stability of commercial Type II lubricants with EP additives that maximise gear system reliability. Military and private helicopter operators prefer DOD-PRF-85734 oils for the wear protection provided by their EP additive technology.

Specification

• DOD-PRF-85734

Typical Properties

• Density (15 °C) 0.9950 kg/L
• Kinematic viscosity 5.16 mm²/s at 98.9 °C, 27.2 mm²/s at 37.8 °C, 8990 mm²/s at −40 °C (35 min)
• Pour point −60 °C; flash point 255 °C; total acid number 0.38 mg KOH/g
• Evaporation loss (6.5 hours, 204 °C) 1.8%
• Ryder gear test average relative rating: 167% of reference oil
• Corrosion and oxidative stability (72 hours, 175 °C): viscosity change at 38 °C 10.3%; sludge 0.1 mg/100 ml