Mobil® Jet Oil 254
Synthetic Aircraft-Type Gas Turbine Lubricant
Mobil Jet Oil 254 is a third-generation synthetic lubricant made from a specially prepared hindered-ester base stock fortified with a special chemical additive package. The result is a product having superior thermal and oxidation stability that resists deterioration and deposit formation, while maintaining the physical characteristics required by builder and military specifications. Because of this, the physical properties of Mobil Jet Oil 254 are similar to currently available, earlier-generation turbine lubricants.
The closely controlled viscosity at -40° C (-40° F), along with a pour point below -54° C (-65° F), ensure good low-temperature fluidity to permit starting and lubrication at -40° C. In extensive laboratory testing and in-flight experience, Mobil Jet Oil 254 exhibits excellent bulk oil stability at temperatures up to 232° C (450° F) for extended periods. The evaporation rate at these temperatures is low enough to prevent excessive loss of volume. The load-carrying ability of Mobil Jet Oil 254 comes from its synthetic base stock viscosity and, therefore, is not subject to loss from viscosity index additive shear. The lubricant has excellent resistance to foaming.
When compared to a typical Type II lubricant, Mobil Jet Oil 254 reduces bulk oil oxidation by up to 50 percent and shows deposit control capability 50 Fahrenheit degrees higher. These properties have been confirmed in various laboratory tests, including the Corrosion-Oxidation Stability Test, Alcor Deposit Test, Erdco High-Temperature Bearing Test, and the Thin Film Oxidation Test. Mobil Jet Oil 254 is compatible with other synthetic gas turbine lubricants meeting MIL-L-23699E. Mixing with other products, however, could result in some loss of the superior performance features of Mobil Jet Oil 254. The lubricant is completelycompatible with all metals used in gas turbine construction, as well as with F Rubber (Viton® A), H Rubber (Buna N), and silicone seal materials. Do not spill the lubricant on insulation, plastic, rubber, or paint.
Mobil Jet Oil 254 is recommended for aircraft gas turbine engines of the turbo-jet, turbo-fan, turbo-prop, and turbo-shaft (helicopter) types in commercial and military service. It also is suitable for aircraft-type gas turbine engines in industrial or marine service.
Mobil Jet Oil 254 is approved against U.S. Military Specification MIL-L-23699E, as well as by the following engine and accessory manufacturers:
- Allison Engine Co.
- General Electric Company
- International Aero Engines
- Pratt & Whitney Group, United Technologies Corp.
- Pratt & Whitney, Canada
- Rolls-Royce Limited
- Garrett Turbine Engine Co. (Allied-Signal Aerospace Co.)
- AiResearch - Auxiliary power units and air cycle machines
- Hamilton Standard Division, United Technologies Corp. - Starters
- Sundstrand Corp. - Constant-speed drives and integrated-drive generators
- Westinghouse Aerospace Electrical Division - Generators
Physical properties are listed in the table. Values not shown as minimum are typical and may vary.
Mobil Jet Oil 254 offers the following advantages and benefits:
- Reduces bulk oil oxidation by 50 percent
- Deposit control increased by 50 Fahrenheit degrees
- Reduces sludge and carbon deposit formation
- Reduces engine maintenance
- Longer seal and bearing life
- Lower oil consumption