Mobil Jet Oil 254

Specifications

Brand

Mobil (ExxonMobil)

Category

Aviation turbine oils

Manufacturer code

201550101010

Availability

On order

Approved for

• Allison
• MIL / NATO

Typical characteristics

Manufacturer's description

Mobil Jet Oil 254 is a third-generation, extra-high-performance synthetic aircraft gas turbine lubricant formulated from a specially prepared hindered-ester base stock fortified with a unique chemical additive package. Compared with typical Type II lubricants, it reduces bulk oil oxidation by up to 50 percent and shows deposit control capability 50°F higher, while operating effectively between -40°C and 232°C. Its closely controlled low-temperature viscosity and pour point below -54°C ensure good fluidity for starting and lubrication down to -40°C, while extensive laboratory and in-flight testing confirm excellent bulk oil stability at temperatures up to 232°C with low evaporation loss. The synthetic base stock viscosity, rather than shear-prone VI additives, provides load-carrying ability, and the lubricant offers excellent resistance to foaming. Mobil Jet Oil 254 is recommended for turbo-jet, turbo-fan, turbo-prop and turbo-shaft (helicopter) gas turbine engines in commercial and military service, as well as industrial and marine gas turbine applications. It is approved against the High Thermal Stability (HTS) classification of MIL-PRF-23699 and carries builder approvals from engine and accessory manufacturers including Honeywell/Lycoming, Rolls-Royce/Allison, CFM International, General Electric, International Aero Engines, Pratt & Whitney, SNECMA, Hamilton Sundstrand and others (specific engine approval must be verified with the builder).

Applications

• Mobil Jet Oil 254 is recommended for aircraft gas turbine engines of the turbo-jet, turbo-fan, turbo-prop, and turbo-shaft (helicopter) types used in commercial and military service. It is also suitable for aircraft-type gas turbine engines used in industrial or marine applications.Mobil Jet Oil 254 is approved against the High Thermal Stability (HTS) classification of U.S. Military Specification MIL-PRF-23699. It is also compatible with other synthetic gas turbine lubricants meeting MIL-PRF-23699. However, mixing with other products is not recommended because the blend would result in some loss of the superior performance characteristics of Mobil Jet Oil 254.Mobil Jet Oil 254 is completely compatible with all metals used in gas turbine construction, as well as with F Rubber (Viton A), H Rubber (Buna N), and other commonly used seal materials. Mobil Jet Oil 254 has the following builder approvals * Engines • Honeywell/Lycoming-Turbines • Rolls-Royce/Allison Engine Company • CFM International • General Electric Company • International Aero Engines • Pratt and Whitney Group • Pratt and Whitney, Canada • Rolls-Royce Limited • SNECMA • Honeywell/Garrett Turbine Engine Company Accessories • Honeywell-Auxiliary power units and air cycle machines • Hamilton Standard-Starters • Hamilton Sundstrand Corp.-APUs, constant-speed drives and integrated-drive generators * Specific engine or equipment approval must be verified with the builder

Performance & benefits

• Chemically stable at high operating temperaturesReduces evaporation losses and lowers oil consumption
• Excellent resistance to foaming Good low temperature fluidityMaintains film strength under rigorous operating conditions Permits start-up and ensures effective lubrication of critical components at temperatures as low as -40 °F

Standards & approvals

• MIL-PRF-23699

  MIL-PRF-23699 — aviation turbine engine oil

  The US military specification for synthetic aviation gas-turbine (jet) engine oils; STD, HTS and CI are its sub-classes by thermal stability/corrosion-inhibition level.