Description
Mobil Avrex S Turbo 256 gas turbine lubricant is a combination of a highly stable synthetic base fluid and a unique chemical additive package. The combination provides outstanding thermal and oxidative stability to resist deterioration and deposit formation in both the liquid and vapor phases, as well as excellent resistance to foaming. It is uniquely suited for use when extreme low temperatures restrict the use of higher viscosity engine oils.
In extensive laboratory testing and in-flight performance, Mobil Avrex S Turbo 256 exhibits excellent bulk oil stability at temperatures up to 176 degrees Celsius (350 F). The evaporation rate at these temperatures is low enough to prevent excessive loss of volume.
Application
Mobil Avrex S Turbo 256 is recommended for aircraft gas turbine engines incommercial and military service, particularly where start-up temperatures arebelow -40°C (-40°F). The product is approved against U.S. MilitarySpecification MIL-PRF-7808, Grade 3, and by the following engine and accessorymanufacturers:
Engine and Accessory Approvals
Approved in equipment specifying 3 centistokes, MIL-PRF-7808 (latest revision)lubricants. Mobil Avrex S Turbo 256 is compatible with other synthetic gasturbine lubricants meeting MIL-PRF-7808 or MIL-PRF-23699 Specifications.However, mixing with other products is not recommended because the blendwould result in some loss of the performance characteristics of Mobil Avrex STurbo 256. The product is compatible with all metals used in gas turbineconstruction, as well as with F rubber (Viton A), H rubber (Buna N), and FVMQrubber (fluorosilicone).
Advantages
| Uniquely suited for use when extreme low temperatures restrict the use of higher viscosity engine oils. |
Typical Properties
| Avrex S Turbo 256 | MIL-PRF-7808 Grade 3 Requirements | |
| Product Number | 49423-7 | – |
| Viscosity | ||
| cSt at 100°C (212°F) | 3.3 | 3.0 min |
| cSt at 40°C (104°F) | 13.3 | 11.0 min |
| cSt at -51°C (-60°F) after 3 hr | 10,459 | 17,000 max |
| cSt at -51°C (-60°F) after 72 hr | 10,495 | 17,000 max |
| Flash Point, °C (°F) | 224 (435) | 210 (410) min |
| Fire Point, °C (°F) | 256 (493) | – |
| Pour Point, °C (°F) | -60 (-75) | – |
| Specific Gravity, 15/15°C (60/60°F) | 0.9634 | – |
| TAN, mg KOH/g | 0.03 | 0.30 max |
| Evaporation Loss, % | ||
| 6.5 hr at 204°C (400°F) | 19.6 | 30 max |
| Foam, volume/collapse time | ||
| Static, ml/sec | 20/6 | 100/60 max |
| Dynamic, ml/sec | pass | 100/60 max |
| Rubber Swell, % | ||
| H Rubber, 168 hr at 70°C (158°F) | 28.6 | 12-35 |
| F Rubber, 72 hr at 175°C (347°F) | 19.1 | 2-25 |
| FS Rubber, 72 hr at 150°C (302°F) | 10.6 | 2-25 |
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