Mobil Jet Oil 254 is formulated to meet the demanding requirements of latest technology aircraft-type gas turbines operating over a wide range of severe operating conditions. 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 F higher. These properties have been confirmed in various laboratory tests including; the Corrosion-Oxidation Stability Test, Alcor Deposition Test, Vapor Phase Coker, Erdco High-Temperature Bearing Test, Ryder Gear and the Mobil Thin Film Oxidation Test.The closely controlled low-temperature viscosity of Mobil Jet Oil 254, along with its low pour point (below -54 ºC), ensure good low-temperature fluidity to permit starting and lubrication at temperatures as low as -40 ºC. In extensive laboratory testing and in-flight experience, Mobil Jet Oil 254 also exhibits excellent bulk oil stability at temperatures up to 232 ºC (450 ºF) 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.Key features and benefits include:

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 ºF
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


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
-Honeywell/Lycoming-Turbines X
-Rolls-Royce/Allison Engine Company X
-CFM International X
-General Electric Company X
-International Aero Engines X
-Pratt and Whitney Group X
-Pratt and Whitney, Canada X
-Rolls-Royce Limited X
-Honeywell/Garrett Turbine Engine Company X
-Honeywell-Auxiliary power units and air cycle machines X
-Hamilton Standard-Starters X
-Hamilton Sundstrand Corp.-APUs, constant-speed drives and integrated-drive generators X
Mobil Jet Oil 254
Approved against U.S. Military Specification Mil-PRF-23699F High Thermal Stability (HTS) X

Typical Properties

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 Gravity 1.0044
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 ºC 0
Sequence II, 93.5 ºC 10
Sequence III, 75 ºC (after 200 F test) 0
Foam Stability, after 1 min settling, ml 0
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 A 2,715 ,114


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