Every commercial flight, military mission and helicopter operation depends on one critical factor: reliability.
Inside a gas turbine engine, bearings rotate at extremely high speeds while operating under intense mechanical loads and temperatures that can exceed 200°C. During flight, these same components must also perform reliably in environments where outside temperatures can fall below -50°C.
Keeping these critical engine components protected requires far more than conventional lubrication. Aviation turbine oils are specially engineered to resist oxidation, withstand extreme temperatures, minimise deposits and provide consistent lubrication throughout every phase of flight.
Among the world’s most widely recognised aviation turbine lubricants is Mobil Jet™ Oil II. Developed by ExxonMobil, this fully synthetic 5 cSt turbine oil has accumulated more than five billion flight service hours over more than five decades of operational use. Its proven reliability has made it one of the preferred turbine lubricants for commercial airlines, military operators, helicopter fleets, maintenance organisations and industrial gas turbine operators worldwide.
Mobil Jet™ Oil II is a fully synthetic 5 centistoke (5 cSt) aviation turbine lubricant developed for modern gas turbine engines operating under demanding conditions.
The lubricant is formulated to meet the requirements of MIL-PRF-23699 Standard (STD) and is qualified under SAE AS5780 SPC, making it suitable for numerous commercial aviation, military, helicopter and industrial gas turbine applications where approved by the original equipment manufacturer (OEM).
With decades of operational experience and billions of accumulated flight hours, Mobil Jet™ Oil II has become one of the most trusted turbine lubricants in the global aviation industry.
Product Category
Aircraft Lubricant → Turbine Engine Oil → Synthetic Aviation Oil → 5 cSt Turbine Oil
Military Specification
MIL-PRF-23699
Performance Classification
SAE AS5780 SPC (Standard Performance Capability)
Typical Applications
Commercial aircraft
Regional aircraft
Business jets
Military aircraft
Helicopters
Auxiliary Power Units (APUs)
Aircraft accessory systems
Industrial gas turbines
Key Benefits
Excellent thermal stability
Outstanding oxidation resistance
Superior deposit control
Excellent low-temperature performance
Bearing and gearbox protection
Reduced oil evaporation
Long lubricant service life
Aircraft turbine lubricants are generally classified according to viscosity, measured in centistokes (cSt). Modern turbine engines primarily use 5 cSt synthetic oils, which provide an effective balance between cold-weather performance and high-temperature protection.
Compared with earlier lubricant technologies, 5 cSt synthetic turbine oils provide:
These characteristics have made 5 cSt synthetic lubricants the industry standard for many modern turbine-powered aircraft.
Very few aviation products remain in widespread operational use for more than fifty years.
Mobil Jet™ Oil II has earned its reputation through consistent performance across thousands of commercial aircraft, military fleets, helicopters and industrial turbine installations worldwide.
Its accumulated five billion flight service hours represent decades of confidence from airlines, engine manufacturers and maintenance organisations that depend on reliable lubrication to support safe and efficient operations.
Modern turbine engines generate continuous high temperatures during operation.
Mobil Jet™ Oil II is designed to maintain its lubricating characteristics under demanding thermal conditions, helping protect critical engine components throughout extended operating periods.
Exposure to oxygen and elevated temperatures gradually causes lubricants to deteriorate, potentially creating deposits that affect engine cleanliness.
Mobil Jet™ Oil II is formulated to resist oxidation, helping minimise deposit formation and maintain consistent lubrication performance.
Cleaner engines contribute to improved operational reliability.
By reducing varnish and sludge formation, Mobil Jet™ Oil II supports cleaner engine components and helps reduce maintenance requirements over time.
Aircraft frequently operate in extremely cold atmospheric conditions.
Mobil Jet™ Oil II remains sufficiently fluid during low-temperature operation, helping ensure rapid lubrication during engine start-up and dependable protection throughout the flight envelope
High-speed bearings and accessory gearboxes require a durable lubricating film to minimise wear.
Mobil Jet™ Oil II helps protect these critical components, contributing to improved reliability and extended service life.
High operating temperatures can increase lubricant evaporation.
Mobil Jet™ Oil II is formulated to minimise evaporation losses, helping maintain lubricant effectiveness during extended engine operation.
Its resistance to oxidation, thermal degradation and deposit formation enables Mobil Jet™ Oil II to deliver reliable performance throughout recommended maintenance intervals, supporting lower maintenance costs and improved fleet availability.
Mobil Jet™ Oil II is widely used in:
Mobil Jet™ Oil II is approved or accepted for use in numerous engine and equipment applications associated with:
Always verify the latest OEM approval documentation before selecting any aviation lubricant for a specific aircraft or engine model.
Several high-performance synthetic turbine lubricants are available for aviation applications.
Some of the most widely recognised products include:
| Brand | Product |
|---|---|
|
ExxonMobil |
Mobil Jet™ Oil II
|
|
Eastman |
Turbo Oil 2380
|
|
Shell |
AeroShell Turbine Oil 500 |
|
Shell |
AeroShell Turbine Oil 560 |
|
NYCO |
Turbonycoil 600 |
|
Royco |
Royco 899 |
Although several high-quality synthetic turbine lubricants meet similar industry specifications, every aircraft engine is approved for specific lubricants.
The correct lubricant should always be selected according to:
Lubricant selection should never be based solely on product availability or price.
Using an approved aviation turbine lubricant helps support:
Selecting the appropriate lubricant plays an important role in maintaining aircraft safety, operational efficiency and long-term reliability.
Mobil Jet™ Oil II is a fully synthetic 5 cSt aviation turbine lubricant developed for gas turbine engines operating under demanding commercial, military and industrial conditions.
MIL-PRF-23699 is the U.S. military performance specification for synthetic aircraft turbine engine lubricants. Products meeting this specification satisfy rigorous requirements for thermal stability, oxidation resistance, wear protection and low-temperature performance.
SAE AS5780 is an industry standard that classifies aviation turbine lubricants according to performance capability. SPC (Standard Performance Capability) oils are designed for a broad range of approved turbine engine applications.
Yes. Mobil Jet™ Oil II is widely used in helicopter turbine engines where approved by the engine manufacturer.
Not automatically. Even when lubricants meet similar specifications, substitution should only be made in accordance with the aircraft or engine manufacturer's approved lubricant documentation.
Favia supplies genuine aviation lubricants and aircraft consumables to airlines, helicopter operators, MRO facilities, defence organisations and industrial customers across the Middle East and international markets.
Our experienced team assists customers in selecting the correct aviation lubricant based on aircraft type, engine model and OEM approvals, helping ensure technical compliance and dependable product availability.
Whether you require routine maintenance stock, urgent AOG support or fleet-wide procurement, Favia is committed to providing authentic aviation products, responsive service and reliable global logistics.
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