Mobil Jet™ Oil II

View all Jet Oils

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

Running low?

Mobil Jet™ Oil II is now available for purchase at

Shop now
Contact an expert
Send to a colleague

Product Information

   Mobil Jet™ Oil II performance profile 1.668 MB/pdf
Download Send to a colleague
   Mobil Jet™ Oil II success story 950.956 KB/pdf
Download Send to a colleague


ExxonMobil Begins Production at Port Allen Aviation Lubricants Plant

The Port Allen aviation lubricants plant has achieved full production for the entire line of Mobil Jet™ engine lubricants. The state-of-the-art facility is part of a $200 million ExxonMobil investment in the Baton Rouge area.

English, Aviation news

Aviation lubricant shelf life

Find out the recommended shelf life of ExxonMobil aviation lubricants.

English, Technical topics

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.

English, Technical topics

Storage and handling recommendations and best practices

Applying the first-in, first-out (FIFO) inventory method can help reduce the risks of oil and grease deterioration caused by lengthy storage. Learn more.

English, Technical topics

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.

Specifications and Approvals

Mobil Jet Oil II has the following builder approvals
-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
-Pratt and Whitney, Canada X
-Rolls-Royce Limited X
-Honeywell/Garrett-Turbine Engine Company X
-Turbomeca 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 II is approved against
Mil-PRF-23699-STD X

Typical Properties

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
  • 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
  • Turbomeca
  • 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.

    Learn More
  • 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.

    Learn More
  • 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.

    Learn More