Mobil Jet™ Oil 387

Diagram of oil flow on gears

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Reasons to trust Mobil Jet Oil 387

  1. Designed to deliver optimal engine performance and help operators avoid unscheduled/premature engine maintenance
  2. Offers exceptional elastomer compatibility, helping minimize oil leaks that can cause delays, cancellations and costly repairs
  3. Provides optimal wear protection, oxidative and thermal stability, and excellent deposit control, helping operators reduce unscheduled maintenance and maximize revenue-generating hours
  4. Offers excellent low-temperature fluidity in extreme temperatures as low as -40 degrees Fahrenheit 

Mobil Jet™ Oil 387 underwent 10+ years of extensive research and development and is one of the most tested oils on the market. It was subjected to rigorous testing on the ground and in flight, and was designed with custom-made molecules to deliver outstanding performance in HTS/HPC oils.

Proactively developed to respond to the evolving needs of our customers and the industry, Mobil Jet Oil 387 is our most advanced turbine oil ever developed. Specifically formulated to deliver unsurpassed engine performance, it strikes the perfect balance, providing optimal engine performance and advanced protection for engines and components. Featuring exceptional elastomer compatibility, excellent thermal and oxidative stability and advanced deposit control, Mobil Jet Oil 387 delivers a balance that has never before been achieved with a turbine oil, raising the bar in jet engine lubrication.

Mobil Jet Oil 387 is approved for use in an array of engine models and components.

Product information

Data sheets

Technical Resources


Mobil Jet Oil 387 shows excellent performance controlling deposits typically experienced in both the liquid and vapor phases in bearing compartments, oil supply lines, and breather/scavenger lines. 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 viscosity of Mobil Jet Oil 387 at -40°C (-40°F), and a pour point below -54°C (-65°F), ensure the good low-temperature fluidity which permits starting and lubrication at temperatures as low as -40°C. In extensive laboratory testing, Mobil Jet Oil 387 exhibits excellent bulk oil stability at temperatures greater than 225°C (437°F).

Key features and benefits include: 

Features Advantages and Potential Benefits
Long-duration fluorocarbon compatibility   Helps avoid premature or unscheduled engine repairs. Helps prevent leaks that can lead to air craft delays and cancellations.
Outstanding oil life characteristics, such as bulk oil stability, viscosity and TAN control Helps minimize formation of sludge and carbon deposits which allows better engine efficiency and reduced engine repair costs as well potentially achieving longer oil drain intervals (in certain applications such as marine and land based turbines), effective lubrication at high operating temperatures
Very low vapor/mist and thin film deposition resistance Helps control deposits in air vent tubes, bearingcompartments, and scavenge oil lines which will all result in reduced engine maintenance costs
Good low temperature fluidity Permits start-up and ensures effective lubrication of critical components (such as APUs in ETOPS applications) at temperatures as low as -40 °F


Mobil Jet Oil 387 is approved against the new SAE AS5780 High Performance Capability (HPC) standard. This civil specification was developed to meet the growing performance and quality needs that commercial airlines seek, especially with the entrance of new, higher-output and lower consumption engines.

OEM in-house evaluation/approval programs are also underway. Once complete, Mobil Jet Oil 387 will be commercialized for use in aircraft gas turbine engines, including turbo-jet, turbo-fan, turbo-prop, and turbo-shaft (helicopter), in commercial and military service. In addition, it will be suitable for aircraft-type gas turbine engines in industrial and marine applications.

Mobil Jet Oil 387 is compatible with other synthetic gas turbine lubricants meeting U.S. Military Specification MIL-PRF-23699. Mixing with other products, however, could result in some loss of its superior performance features. The lubricant 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. Engine/OEM Evaluations

Mobil Jet Oil 387 has the following builder approvals: * 

General Electric Aviation 

Rolls Royce 

Pratt & Whitney 

Honeywell APUs 

UTC Aerospace Systems APUs, Generators and Starters 


Mobil Jet Oil 387 has the following builder approvals  in progress  : *  

CFM International 

Engine Alliance 

International Aero Engines 

Honeywell turbine engines 


Mobil Jet Oil 387 has the following approvals: 




* Specific engine or equipment approval must be verified with the builder 


Typical Properties*

Mobil Jet Oil 387 Typical Limit
cSt at 100°C (212°F) 5.2 4.9 to 5.4
cSt at 40°C (102°F) 25.9 23.0 min
cSt at -40°C (-40°F) 10140 13,000 max
0.1 % change at -40°C after 72 hr. 0.1 6%max
Flash Point, ° C ( ° F), min 278(532) 246 min.
Fire Point, ° C ( ° F) 292(558) No limit
Autogenous Ignition Temp, ° C ( ° F) 405(761) No limit
Pour Point, ° C( °F) -57 (-71) -54 max
Specific Gravity, 15/15°C (60/60°F) 0.999 No limit
TAN (mg KOH/g sample) 0.03 1.0 max
Evaporation Loss, %    
6.5 hr at 204°C (400°F), 29.5" Hg 4 10 max
Foam, ml    
Sequence 1, 24°C (75°F) 10 25 max
Sequence 2, 93.5°C (200°F) 10 25 max
Sequence 3, 75°C (after 200°F test) 10 25 max
Foam Stability, after 1 min settling, ml 0 0 max
Rubber Swell    
F Rubber, 72 hr at 204°C (400°F), % 15 5 -25
H Rubber, 72 hr at 70°C (158°F), % 15 5 -25
Ryder Gear 2806 No limit
% Hercolube A 104 102 min.

*Typical properties are typical of those obtained with normal production tolerance and may vary slightly, while remaining within specified limits.

Health and safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @

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  • Military use
  • Elastomer compatibility
  • Severe operating conditions
  • Deposit control
  • Extended temperature range
  • Wear protection
  • Maximize component life
  • Balanced formulation
  • High performance
  • SAE AS5780 HPC
  • MIL-PRF-23699-HTS
  • PRI-QPL-AS5780/HPC
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