Mobil Jet™ Oil II

Component of aircraft gas turbine engine

Mobil Jet™ Oil II was the first standard Type II oil on the market. With more than five decades of flight experience, it has accrued over 5 billion hours of on-wing performance.

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

Product information

Data sheets

Technical Resources

All Mobil Jet Oil II resources

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:



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



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.

Mobil Jet Oil II 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

• Turbomeca


• 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


Density @ 15 C, kg/l, ASTM D4052


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, 29.5" Hg, 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


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) @

CFM 56-5A/B
CFM 56-3B/3C
CFM 56-7B
CFM Leap 1A
CFM Leap 1B
CFM Leap 1C
Engine Alliance (EA) GP7200
GE Aviation CF34-10
GE Aviation CF34-10E
GE Aviation CF34-3
GE Aviation CF34-8C
GE Aviation CF34-8E
GE Aviation CF6-50
GE Aviation CF6-80E
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 2100
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
Honeywell 331-600
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 127
Pratt & Whitney 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
Aerolec VFG
CFM 56-2C
Pratt & Whitney PW1400G-JM
Rolls Royce BR715
GE Aviation CF6-6
GE Aviation CF6-80
GE Aviation 9X
GE Aviation CF34-10A
Pratt & Whitney JT9-D
Pratt & Whitney PW1700G
Pratt & Whitney PW1900G
Honeywell GTCP 660
Honeywell HW TSCP-700
Safran VFG
Severe operating conditions
Deposit control
Foaming resistance
Military use
Wear protection
Corrosion protection
High/Low temperature viscosity
  • MIL-PRF-23699-STD
  • PRI-QPL-AS5780/SPC
  • Customer viewing aviation industry news on a tablet

    Aviation news

    Get news updates, newly published reports and articles.

  • Aircraft component of hydraulic system

    Mobil™ HyJet™ V

    Mobil HyJet V is a Type V fire-resistant phosphate ester hydraulic fluid, which is superior in thermal and hydrolytic stability to commercially available Type IV hydraulic fluids. Better stability means the extent of fluid degradation in aircraft systems will be less than Type IV fluids, in-service fluid life will be longer, and consequently aircraft operator maintenance costs may be lower.

  • Airplane tires in a warehouse

    Mobil™ Aviation Grease SHC™ 100

    Mobil Aviation Grease SHC 100 is a supreme performance synthetic grease which combines the unique features of a polyalphaolefin (PAO) synthetic base fluid with those of a high quality lithium complex soap thickener. The thickener system provides a high dropping point, excellent resistance to water wash, and a tenacious structural stability.