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Technical Data Sheet
Eastman™ Turbo Oil 25

  • Aerospace
  • Aviation turbine oil (ATO)
  • Helicopter oil
Key Attributes
  • 5 cSt load carying synthetic lubricant
  • Type II oil in helicopter gear box and transmission

Product Description
Eastman Turbo Oil 25™ is a high load-carrying gas turbine oil, for the most demanding gear applications.

Helicopter operators in both military and private sectors have shown a preference for the DOD-PRF-85734 oils, like Turbo Oil 25, because of the wear protection provided by its extreme pressure additive technology. Eastman is the only oil manufacturer to offer broadly used DOD-PRF-85734 and MIL-PRF-23699 HTS Class oils, to suit all your helicopter oil lubrication needs.

Turbo Oil 25 is formulated from synthetic base stocks and advanced technology additives, to provide the combined thermal and oxidation stability properties of commercial Type II lubricants, with extreme pressure additives to maximise gear system reliability.

Turbo Oil 25 is a DOD-PRF-85734, 5 cSt viscosity class oil, plus extreme pressure additives, for the demanding loads of helicopter gearboxes.

Typical Properties

PropertyTest MethodTypical Value, Units
     @ 15°CASTM D 12980.9950 kg/L
Viscosity, Kinematic 
     @ 37.8°CASTM D 44527.2 mm2/s
     @ -40°C after 35 minutesASTM D 25328,990 mm2/s
     @ 98.9°CASTM D 4455.16 mm2/s
Pour PointASTM D 97-60 °C
Flash PointASTM D92255 °C
Total Acid NumberASTM D 6640.38 mg KOH/g
Evaporation Loss 
     6.5 hrs @ 204°CASTM D 9721.8 %
Foaming Volume 
     Sequence 1 @ 24°CASTM D 8925/0.05 ml/vol
     Sequence 2 @ 93 °CASTM D 8925/0.03 ml/vol
     Sequence 3 @ 24°CASTM D 8925/0.08 ml/vol
Ryder Gear 
     Av. Rel. ratingFED 6508167 % reference oil
     No. of determinationsFED 65082
     Ref. Oil, av. RatingFED 65082,400 lbs/in
Elastomer Compatibility 
     F Rubber Swell (72 hrs @ 204°C)FED-STD-791, 3604.1414 %
     H Rubber Swell (72 hrs @ 70°C)FED-STD-791, 3604.1414 %
     Silicone Rubber tensile strength lossFED-STD-791, 3433 57.657.6 %
Corrosion & Oxidative Stabilitya 
     Aluminium Weight LossASTM D 46360 mg/cm2
     Copper weight LossASTM D 46360.05 mg/cm2
     Iron Weight LossASTM D 46360 mg/cm2
     Magnesium Weight LossASTM D 46360.08 mg/cm2
     Silver Weight LossASTM D 4636-0.07 mg/cm2
     SludgeASTM D 46360.1 mg/100ml
     Total Acid Number ChangeASTM D 46360.56 mg KOH/g
     Viscosity Change 38°CASTM D 463610.3 %

a72 hrs @ 175°C; ASTM D4636, Alternate Procedure 2

Properties reported here are typical of average lots. Eastman makes no representation that the material in any particular shipment will conform exactly to the values given.

Eastman and its marketing affiliates shall not be responsible for the use of this information, or of any product, method, or apparatus mentioned, and you must make your own determination of its suitability and completeness for your own use, for the protection of the environment, and for the health and safety of your employees and purchasers of your products. No warranty is made of the merchantability of fitness of any product, and nothing herein waives any of the Seller's conditions of sale.

8/28/2018 2:23:52 PM