Mobil Jet Oil 254

AIRCRAFT SYNTHETIC OIL

Mobil Jet Oil 254 is a third-generation, extra high performance, synthetic aircraft-type gas turbine lubricant engineered to meet the performance requirements for gas turbine engines used in commercial and military aircraft. This product is formulated from a specially prepared, hindered-ester base stock and fortified with a unique 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. The physical properties of Mobil Jet Oil 254 are similar to those currently available, earlier-generation gas turbine lubricants. The effective operating range of the lubricant is between -40°C (-40 F) and 232°C (450°F).


Features Advantages and Potential Benefits

  • Excellent thermal and oxidation stability Reduces the formation of carbon and sludge deposits
  • Maintains engine efficiency and extends engine life
  • Reduces bulk oil oxidation by 50% and increases deposit control by 50 ?F
  • Excellent wear and corrosion protection Extends seal, gear and bearing life
  • Reduces engine maintenance
  • Viscosity and shear stability across wide temperature range Provides effective lubrication at high operating temperatures
  • Chemically stable at high operating temperatures Reduces evaporation losses and lowers oil consumption
  • Excellent resistance to foaming Maintains film strength under rigorous operating conditions
  • Good low temperature fluidity Permits start-up and ensures effective lubrication of critical components at temperatures as low as -40 ?F

Application

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.

Specifications & Approvals

Engines

  • Honeywell/Lycoming-Turbines
  • Rolls-Royce/Allison Engine Company
  • CFM International
  • General Electric Company
  • International Aero Engines
  • Pratt & 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

Typical Properties

Viscosity
cSt @ 40ºC (102 ºF)26.4
cSt @ 100ºC (212 ºF)5.3
cSt @ -40 C (-40 ºF)11,500
% change @ -40 C after 72 hours -2.2
Pour Point, ºC (ºF), ASTM D 97-62 (-80)
Flash Point, ºC (ºF), ASTM D 92 254 (489)
Fire Point, ºC (ºF)288 (550)
Autogenous Ignition Temp, ºC (ºF)399 (750)
TAN (mg KOH/g sample)0.08
Specific Gravity1.0044
Evaporation Loss, % 
Evaporation Loss, % 6.5 hr @ 204 ºC, 29.5"Hg 2.1,
6.5 hr @ 232 ºC, 29.5" Hg 7.4,
6.5 hr @ 232 ºC, 5.5" Hg (Equals pressure @ 40,000 Ft. altitude)25.2
Foam, ml  
Sequence I, 24 ºC0
Sequence II, 93.5 ºC10
Sequence III, 75 ºC (after 200 F test)0
Foam Stability, after 1 min settling, ml0
Rubber Swell 
F Rubber, 72 hr @ 204 ºC, % 20.8
H Rubber, 72 hr @ 70 ºC, %20.0
Sonic Shear Stability, KV @ 40 C, change, %0.7
Ryder Gear, average lb/in % Hercolube A2,715 ,114