Eastman Turbo Oil 2389 Quart, MIL-PRF-7808

Eastman Turbo Oil 2389 Features & Benefits

• 3 cSt synthetic turbine oil for low-viscosity aviation applications.
• MIL-PRF-7808 Grade 3 qualified.
• Excellent cold-start capability for aircraft APUs and accessories.
• Excellent low-temperature fluidity for cold-weather and cold-soak conditions.
• Thermal and oxidation stability designed for demanding turbine lubrication applications.
• High load-carrying capability comparable to or better than other qualified MIL-PRF-7808 Grade 3 oils.
• Long shelf life in original, unopened quart cans when stored under recommended conditions.

Applications

Technical Specifications

Typical properties are provided for reference and are not product specifications. Refer to the current Eastman technical data sheet and applicable aircraft or equipment maintenance documentation for product requirements.

MIL-PRF-7808 Grade 3

Eastman Turbo Oil 2389 meets or exceeds the requirements of MIL-PRF-7808 Grade 3. Its 3 cSt viscosity provides substantially different low-temperature flow characteristics from the 5 cSt oils commonly used in other turbine-oil applications. This low viscosity is a key reason Turbo Oil 2389 is used in applicable APU and accessory systems where cold-start performance is important.

Always verify the required oil specification against the applicable aircraft maintenance manual (AMM), component maintenance manual (CMM), engine or APU manufacturer's documentation, and current approved-product information before servicing an aircraft.

Cold-Start and Cold-Soak Performance

Turbo Oil 2389 is formulated specifically to provide excellent low-temperature fluidity. Eastman describes the product as providing a significant cold-temperature starting margin and highlights its use in APUs following extended cold-soak conditions at altitude.

The oil combines the low-temperature fluidity of a 3 cSt lubricant with thermal and oxidation stability associated with Type II commercial turbine-oil technology. This combination makes it particularly relevant to applicable APU and accessory lubrication systems where oil viscosity during cold starting is a critical consideration.

Shelf Life & Storage

Eastman lists a 10-year shelf life or more for Turbo Oil 2389 when stored in original, unopened quart cans under recommended conditions, including protection from extreme heat and moisture. Eastman's current aviation shelf-life information also lists 10 years for Turbo Oil 2389 quart cans.

For aircraft maintenance inventory, verify the package date, use-by information and storage requirements on the individual container before use.

Product Information

Frequently Asked Questions

What is Eastman Turbo Oil 2389 used for?

Turbo Oil 2389 is a low-viscosity synthetic turbine oil primarily used in applicable aircraft auxiliary power units (APUs) and accessory systems. It is particularly suited to applications where cold-start and low-temperature fluidity are important.

What specification does Turbo Oil 2389 meet?

Eastman Turbo Oil 2389 is qualified to MIL-PRF-7808 Grade 3.

Is Eastman Turbo Oil 2389 a 3 cSt or 5 cSt oil?

Turbo Oil 2389 is a 3 cSt synthetic turbine oil. Its low viscosity is one of its distinguishing characteristics and contributes to its cold-start performance. It should not be described as a 5 cSt oil.

What is the shelf life of Eastman Turbo Oil 2389?

Eastman lists a shelf life of 10 years or more for Turbo Oil 2389 in original, unopened quart cans when stored under recommended conditions. Check the individual container for applicable date and storage information.

Can Turbo Oil 2389 be used in any aircraft turbine engine?

No. Turbo Oil 2389 should only be used where the aircraft, engine, APU or component manufacturer specifies an applicable MIL-PRF-7808 Grade 3 oil. Always consult the current AMM, CMM, engine/APU manual or other approved maintenance documentation before use.

What is the difference between Turbo Oil 2389 and Eastman Turbo Oil 2380?

Turbo Oil 2389 is a 3 cSt MIL-PRF-7808 Grade 3 oil designed around low-temperature fluidity and APU/accessory applications. Turbo Oil 2380 is a 5 cSt turbine oil qualified to MIL-PRF-23699 STD and SAE AS5780 SPC. The correct product depends on the aircraft or component manufacturer's specified lubricant.

Order Eastman Turbo Oil 2389

Eastman Turbo Oil 2389, BAC #2389-QT, is available from Business Aircraft Consumables in a 1-quart can. For current pricing and availability, see the product options above or contact BAC for assistance with aviation lubricant requirements.