Mobil Jet Oil II Page 1 of 3

Mobil Jet Oil II

ExxonMobil Aviation , Peru
Aircraft Type Gas Turbine Lubricant

Product Description

Mobil Jet Oil II is a high performance aircraft-type gas turbine lubricant formulated with a combination of a highly stable synthetic base fluid and a unique
chemical additive package.  The combination provides outstanding thermal and oxidative stability to resist deterioration and deposit formation in both the
liquid and vapour phases, as well as excellent resistance to foaming. The effective operating range of Mobil Jet Oil II is between -40ºC (-40 ºF) and 204 ºC
(400ºF).
 
Mobil Jet Oil II is engineered for aircraft gas turbine engines used in commercial and military service requiring MIL-PRF-23699-STD level performance.  It
also is recommended for aircraft-type gas turbine engines in industrial or marine service applications
 

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

Reduces the formation of carbon and sludge deposits

Excellent thermal and oxidation stability
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.
Mobil Jet Oil II has the following builder approvals *
Engines
• Honeywell/Lycoming-Turbines
• Rolls-Royce/Allison Engine Company
• CFM International
• General Electric Company
• International Aero Engines

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• Pratt and Whitney Group
• Pratt and Whitney, Canada
• Rolls-Royce Limited
• SNECMA
• Honeywell/Garrett Turbine Engine Company
• Turbomeca
Accessories
• 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:

MIL-PRF-23699-STD

PRI-QPL-AS5780/SPC

Properties and Specifications

Property  

Autogenous-ignition temperature test, deg.C, 30 CFR 35.20 404

Change in Kinematic Viscosity, 72 h @ -40 C, %, ASTM D2532 0.15

Density @ 15 C, kg/l, ASTM D4052 1.0035

Elastomer Compatibility, AMS-3217/4 (72hrs @204C), % swell, FTMS 791-3604 15.6

Elastomer Compatibility,AMS-3217/1(72hr @70C), % swell, FTMS 791-3604 16.4

Evaporation Loss, 6.5 h, 204 C, mass%, ASTM D972(mod) 3.0

Evaporation Loss, 6.5 hr @ 232 C, 29.5" Hg, mass %, ASTM D972(mod) 10.9

Evaporation Loss, 6.5 hr @ 232 C, 5.5" Hg, mass %, ASTM D972(mod) 33.7

Fire Point, °C, ASTM D92 285

Flash Point, Cleveland Open Cup, °C, ASTM D92 270

Foam, Sequence I, Tendency, ml, ASTM D892 8

Foam, Sequence II, Tendency, ml, ASTM D892 10

Foam, Sequence III, Tendency, ml, ASTM D892 8

Kinematic Viscosity @ 100 C, mm2/s, ASTM D445 5.1

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Property  

Kinematic Viscosity @ 40 C, mm2/s, ASTM D445 27.6

Kinematic Viscosity @ -40 C, mm2/s, ASTM D445 11000

Pour Point, °C, ASTM D5950 -59

Shear Stability, %KV loss, ASTM D2603 0.9

Total Acid Number, mgKOH/g, ARP 5088 0.03

Ryder Gear Load Carrying, % vs ref., FTMS 791-6508 115

Health and safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @ http://www.msds.exxonmobil.com
/psims/psims.aspx
All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries unless indicated otherwise.
08-2021
Exxon Mobil Corporation
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Spring TX 77389
For additional technical information or to identify the nearest U.S. ExxonMobil supply source, call +1 800 662-4525.
http://www.exxonmobil.com
Due to continual product research and development, the information contained herein is subject to change without notification.  Typical Properties may
vary slightly.

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03.11.2021