Mobil Jet™ Oil 254

Inside component of aircraft engine

Mobil Jet™ Oil 254 has provided proven trusted performance for more than 30 years.

This third-generation, high thermal stability (HTS) oil was formulated to deliver exceptional high-temperature thermal stability and improved resistance to deterioration and deposit control versus Standard Type II oils. ExxonMobil Research and Engineering testing showed Mobil Jet Oil 254 lubricant offers excellent resistance to coking and deposit control, and provides exceptional oxidation and corrosion protection. Laboratory tests indicate Mobil Jet Oil 254 provides a 40 percent advantage in higher-temperature bulk oil stability vs. competitive HTS oils tested. 

Overall, Mobil Jet Oil 254 delivers improved resistance to deterioration and deposit formation compared to standard Type II oils and can offer.

Reasons to trust Mobil Jet Oil 254

  1. Offers exceptional resistance to carbon coking and deposit formation, helping operators reduce shop visits and maintenance costs
  2. Helps operators reduce consumption costs due to its outstanding evaporative loss properties
  3. Offers outstanding engine protection, even under extremely high operating temperatures
  4. Provides excellent low-temperature fluidity in startups as low as -40 degrees Fahrenheit 

Product information

Data sheets

Technical Resources

All Mobil Jet Oil 254 resources

Features and Benefits

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:



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

• Rolls-Royce/Allison Engine Company

• CFM International

• General Electric Company

• International Aero Engines

• Pratt and Whitney Group

• Pratt and Whitney, Canada

• Rolls-Royce Limited


• Honeywell/Garrett Turbine Engine Company


• 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


Specifications and Approvals

This product has the following approvals:



Properties and Specifications



Autogenous-ignition temperature test, deg.C, 30 CFR 35.20


Change in Kinematic Viscosity, 72 h @ -40 C, %, ASTM D2532


Elastomer Compatibility, AMS-3217/4 (72hrs @204C), % swell, FTMS 791-3604


Elastomer Compatibility,AMS-3217/1(72hr @70C), % swell, FTMS 791-3604


Evaporation Loss, 6.5 h, 204 C, mass%, ASTM D972(mod)


Evaporation Loss, 6.5 hr @ 232 C, 5.5" Hg, mass %, ASTM D972(mod)


Fire Point, °C, ASTM D92


Flash Point, Cleveland Open Cup, °C, ASTM D92


Foam, Sequence I, Tendency, ml, ASTM D892


Foam, Sequence II, Tendency, ml, ASTM D892


Foam, Sequence III, Tendency, ml, ASTM D892


Kinematic Viscosity @ 100 C, mm2/s, ASTM D445


Kinematic Viscosity @ 40 C, mm2/s, ASTM D445


Kinematic Viscosity @ -40 C, mm2/s, ASTM D445


Pour Point, °C, ASTM D5950


Shear Stability, %KV loss, ASTM D2603


Specific Gravity 60 F / 60 F, ASTM D1429


Total Acid Number, mgKOH/g, ARP 5088


Ryder Gear Load Carrying, % vs ref., FTMS 791-6508



Health and safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @

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CFM 56-3B/3C
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CFM Leap 1A
CFM Leap 1B
CFM Leap 1C
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Rolls Royce Trent 500
Rolls Royce Trent 700
Rolls Royce Trent 800
GE Aviation CF6-80E
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International Aero Engines (IAE) V2500
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Honeywell 131-9B
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Hamilton Sundstrand/UTAS APS 500
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Hamilton Sundstrand/UTAS APS 2000
Hamilton Sundstrand/UTAS APS 2300
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Hamilton Sundstrand/UTAS VFG
Hamilton Sundstrand/UTAS VFSG
Hamilton Sundstrand/UTAS IDG
Hamilton Sundstrand/UTAS Starters
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CFM 56-2C
Rolls Royce BR715
GE Aviation CF6-6
Pratt & Whitney JT9-D
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Honeywell GTCP 660
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    Military use
    Severe operating conditions
    Deposit control
    Corrosion protection
    High/Low temperature viscosity
    Foaming resistance
    Extended temperature range
    Oxidation stability
    Low temperature performance
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