Mobil Jet™ Oil II

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Mobil Jet™ Oil II was the first standard Type II oil on the market. After more than half a century, it continues to be the preferred oil of choice and is used in more than 50 percent of aircrafts in operation today.

This legendary, hassle-free, second-generation oil helps keep engines clean and operating at peak efficiency. Laboratory tests and engine inspections confirm it can handle extreme speeds, temperatures (up to 204 degrees Celsius/400 F) and stresses without breaking down. 

Reasons to trust Mobil Jet Oil II

  1. It offers excellent deposit control, helping maintain engine cleanliness and reducing maintenance costs
  2. Provides superb elastomer compatibility, helping operators maximize component life and minimize oil consumption
  3. Offers exceptional wear performance, helping reduce component replacement costs and extend engine gear and bearing life
  4. Provides exceptional low-temperature fluidity and outstanding protection at high speeds 
  5. It carries an extensive range of approvals, giving operators increased levels of flexibility

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Product Information

   Mobil Jet™ Oil II performance profile 348.953 KB/pdf
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   Mobil Jet™ Oil II success story 950.956 KB/pdf
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  • CFM 56-5A/B
  • CFM 56-5B
  • CFM 56-7B
  • CFM Leap-1A
  • CFM 56-5C
  • Engine Alliance (EA) GP7200
  • GE CF34-10
  • GE Aviation CF34-10A
  • GE Aviation CF34-3
  • GE Aviation CF34-8
  • GE Aviation CF6-50
  • GE Aviation CF6-80C2
  • GE Aviation CF6-80E1
  • GE Aviation GE90
  • GE Aviation GEnX-1B
  • GE Aviation GEnX-2B
  • Hamilton Sundstrand/UTAS IDG
  • Hamilton Sundstrand/UTAS VFSG
  • Hamilton Sundstrand/UTAS VFG
  • 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 APS 500
  • Hamilton Sundstrand/UTAS Starters
  • Honeywell 131-9
  • Honeywell 131-9B
  • Honeywell 131-9C
  • Honeywell 331-200
  • Honeywell 331-350
  • Honeywell 331-500/600
  • Honeywell GTCP-36-300
  • Honeywell GTCP-85
  • Honeywell HGT-1700
  • Honeywell HGT-750
  • Honeywell RE220
  • International Aero Engines (IAE) V2500
  • Pratt & Whitney - PW1100G-JM
  • Pratt & Whitney - PW1500G
  • Pratt & Whitney - PW2000
  • Pratt & Whitney - PW4000
  • Pratt & Whitney - PW6000
  • Pratt & Whitney Canada 127
  • Pratt & Whitney Canada 150
  • Pratt & Whitney Canada 901
  • Pratt & Whitney Canada 980
  • Pratt & Whitney JT8-D
  • Rolls Royce - RB211-500
  • Rolls Royce Trent 500
  • Rolls Royce Trent 700
  • Rolls Royce Trent 800
  • Rolls Royce Trent 900
  • Rolls Royce/Allison Engines 3007
  • Aerolec VFG
  • Turbomeca
  • Severe operating conditions
  • Deposit control
  • Foaming resistance
  • Military use
  • Wear protection
  • Corrosion protection
  • High/Low temperature viscosity
  • Mil-PRF-23699F-STD
  • PRI-QPL-AS5780/SPC

Resources

Aviation lubricant shelf life

Find out the recommended shelf life of ExxonMobil aviation lubricants.

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Jet engine oil consumption factors

Many factors influence oil consumption. This document focuses on two key factors: deoilers and seals, and their effect on oil degradation.

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Jet engine oil system, part 1

International air regulations require that each engine is equipped with a self-contained oil system capable of providing continuous oil flow to the engine. Visit the page to find out more.

English, Technical topics

ExxonMobil aviation celebrates 50th anniversary of Mobil Jet Oil™ II

Press release - ExxonMobil aviation recently celebrated the 50th anniversary of its popular Mobil Jet™ Oil II at its production plant in New Jersey.

English, Aviation news

Features and benefits

Mobil Jet Oil II is formulated to meet the demanding requirements of aircraft-type gas turbines operating over a wide range of severe operating conditions. The product has a high specific heat in order to ensure good heat transfer from oil-cooled engine parts.  In extensive laboratory testing and in-flight performance, Mobil Jet Oil II exhibits excellent bulk oil stability at temperatures up to 204ºC (400 ºF).  The evaporation rate at these temperatures is low enough to prevent excessive loss of volume.  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
Excellent wear and corrosion protection Extends gear and bearing life
Reduces engine maintenance
Retains viscosity and film strength across wide temperature range Provides effective lubrication at high operating temperatures
Chemically stable Reduces evaporation losses and lowers oil consumption
Low pour point Eases start-up in low ambient temperature conditions

Applications

Mobil Jet Oil II is recommended for aircraft gas turbine engines of the turbo-jet, turbo-fan, turbo-prop, and turbo-shaft (helicopter) types in commercial and military service. It is also recommended for aircraft-type gas turbine engines used in industrial or marine applications. Mobil Jet Oil II is approved against the Standard Performance (STD) 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 performance characteristics of Mobil Jet Oil II. Mobil Jet Oil II is compatible with all metals used in gas turbine construction, as well as with F Rubber (Viton A), H Rubber (Buna N), and silicone seal materials.

Specifications and Approvals

Mobil Jet Oil II has the following builder approvals
Engines  
-Honeywell/Lycoming-Turbine engines X
-Rolls-Royce/Allison Engine Company X
-CFM International X
-General Electric Company X
-IAE International X
-Pratt and Whitney Group X
-SNECMA X
-Pratt and Whitney, Canada X
-Rolls-Royce Limited X
-Honeywell/Garrett-Turbine Engine Company X
-Turbomeca X
Accessories
 
-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 II is approved against
Mil-PRF-23699F-STD X
PRI-QPL-AS5780/SPC X

Typical Properties

Viscosity
cSt @ 40ºC (102ºF) 27.6
cSt @ 100ºC (212ºF) 5.1
cSt @ -40ºC (-40ºF) 11,000
% change @ -40ºC after 72 hours 0.15
Pour Point, ºC (ºF), ASTM D 97 -59 (-74)
Flash Point, ºC (ºF), ASTM D 92 270 (518)
Fire Point, ºC (ºF) 285 (545)
TAN (mg KOH/g sample) 0.03
Density @15 ºC, kg/l, ASMT D 4052 1.0035
Evaporation Loss, %  
6.5 hr @ 204ºC, 29.5" Hg 3.0
6.5 hr @ 232ºC, 29.5" Hg 10.9
6.5 hr @ 232ºC, 5.5" Hg 33.7
(Equals pressure @ 40,000 Ft. altitude)  
Foam, ml  
Sequence I, 24ºC 8
Sequence II, 93.5ºC 10
Sequence III, 75ºC (after 200 F test) 8
Foam Stability, after 1 min settling, ml 0

Rubber Swell

F Rubber, 72 hr @ 204º C, % 15.6
H Rubber, 72 hr @ 70ºC, % 16.4
Sonic Shear Stability, KV @ 40ºC, change, % 0.9
Ryder Gear, Ave. lb/in % Hercolube A 2750 ,115

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