Mobil Jet™ Oil 254

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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 
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Product information

   Mobil Jet™ Oil 254 performance profile 321.216 KB/pdf
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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 depositsMaintains engine efficiency and extends engine lifeReduces bulk oil oxidation by 50% and increases deposit control by 50 ºF
Excellent wear and corrosion protection Extends seal, gear and bearing lifeReduces 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.

Specifications and approvals

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-23699 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
  • CFM 56-5A/B
  • CFM 56-3B/3C
  • CFM 56-7B
  • CFM Leap 1A
  • CFM Leap 1B
  • CFM Leap 1C
  • Rolls Royce - RB211-500
  • Rolls Royce Trent 500
  • Rolls Royce Trent 700
  • Rolls Royce Trent 800
  • GE Aviation CF6-80E
  • GE Aviation CF6-50
  • GE Aviation CF34-3
  • GE Aviation CF34-8C
  • GE Aviation CF34-8E
  • International Aero Engines (IAE) V2500
  • Engine Alliance (EA) GP7200
  • GE Aviation CF34-10
  • GE Aviation CF34-10E
  • GE Aviation GE90
  • GE Aviation GEnX-1B
  • GE Aviation GEnX-2B
  • Pratt & Whitney JT8-D
  • Pratt & Whitney PW2000
  • Pratt & Whitney PW4000
  • Pratt & Whitney PW6000
  • Pratt & Whitney PW1500G
  • Pratt & Whitney Canada 901
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  • Honeywell GTCP 36-300
  • Honeywell GTCP-85
  • Honeywell 131-9B
  • Honeywell 131-9C
  • Honeywell 331-200
  • Honeywell 331-350
  • Honeywell 331-500
  • Honeywell HGT-750
  • Honeywell HGT-1700
  • Honeywell RE220
  • Hamilton Sundstrand/UTAS APS 500
  • Hamilton Sundstrand/UTAS APS 1000
  • Hamilton Sundstrand/UTAS APS 2000
  • Hamilton Sundstrand/UTAS APS 2300
  • Hamilton Sundstrand/UTAS APS 2600
  • Hamilton Sundstrand/UTAS APS 3200
  • Hamilton Sundstrand/UTAS VFG
  • Hamilton Sundstrand/UTAS VFSG
  • Hamilton Sundstrand/UTAS IDG
  • Hamilton Sundstrand/UTAS Starters
  • Aerolec VFG
  • CFM 56-2C
  • Rolls Royce BR715
  • GE Aviation CF6-6
  • Pratt & Whitney JT9-D
  • Pratt & Whitney PW1900G
  • Honeywell GTCP 660
  • Honeywell HW TSCP-700
  • Military use
  • Severe operating conditions
  • Deposit control
  • Corrosion protection
  • High/Low temperature viscosity
  • Foaming resistance
  • Extended temperature range
  • Oxidation stability
  • Low temperature performance
  • MIL-PRF-23699-HTS
  • PRI-QPL-AS5780/HPC

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