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A History

MIL-PRF-23699 is a military specification that outlines the requirements for synthetic lubricating oils used in gas turbine engines, particularly those employed in aircraft and related aerospace applications. Developed by the United States Department of Defense, this specification ensures that the lubricants meet stringent standards to guarantee optimal performance and reliability in demanding operational environments.


MIL-PRF-23699 lubricants meet stringent military specifications and find widespread use in military and commercial aerospace applications, particularly in gas turbine engines powering various aerospace vehicles such as fighter jets and helicopters.

These lubricants are crucial for optimal engine performance, longevity, and reliability. Their primary function is to reduce friction in gas turbine engines, safeguarding rotating and sliding components like turbine blades and bearings from wear and tear caused by extreme temperatures and high rotational speeds. By acting as a protective barrier, these lubricants minimize friction and contribute to the overall efficiency of the engine.

Additionally, MIL-PRF-23699 lubricants offer vital corrosion protection. Aerospace vehicles often face challenging environments, including high altitudes, temperature variations, and exposure to atmospheric elements. These lubricants create a protective film on engine surfaces, preventing corrosion and maintaining the structural integrity of essential components.

Additional Attributes

Mil-Spec-23699 Colored Chart

Mil-Spec-23699 Benefits, Uses, and Specifications

Enhanced PerformanceImproves overall lubrication efficiency, reducing friction and wear
Extended LifespanIncreases the lifespan of machinery and equipment, leading to cost savings
Aviation LubricationSpecifically designed for high-temperature stability in aircraft engines
Industrial ApplicationsSuitable for various industrial machinery, including turbines and compressors
ViscosityHigh viscosity (e.g., ISO VG 220) to ensure stability in extreme conditions
Corrosion ResistanceProvides excellent protection against corrosion, maintaining component integrity
Additional Specification Information

Additional Specification Information

  • Viscosity: The specification defines the viscosity grade of the lubricating oil, ensuring it meets specific requirements to provide adequate lubrication across a range of temperatures.

  • Thermal Stability: MIL-PRF-23699 oils must exhibit high thermal stability to withstand the extreme temperature variations experienced by gas turbine engines during operation. This property helps prevent the formation of deposits and sludge that can impede engine performance.

  • Oxidation Resistance: The lubricants are required to resist oxidation, ensuring they maintain their effectiveness over extended periods of use. This property is crucial for preventing the breakdown of the oil and maintaining its lubricating properties.

  • Corrosion Prevention: MIL-PRF-23699 lubricants must have corrosion-inhibiting properties to protect engine components from rust and corrosion, particularly in the presence of moisture.

  • Low Temperature Fluidity: The specification addresses the need for low-temperature fluidity, ensuring that the lubricants remain fluid and effective in cold environments, a crucial factor for aircraft operating at high altitudes.

These products either meet or are approved to the MIL-PRF-23699 specification.

Please consult the product page and product description for the specific grade/size you intend to purchase to ensure it will be supplied with MIL-PRF-23699 paperwork.

MIL-PRF-23699: In Conclusion

MIL-PRF-23699 stands as a crucial standard in ensuring the reliability and performance of gas turbine engines in aerospace applications. By adhering to these specifications, lubricant manufacturers contribute to the longevity and efficiency of military and commercial aircraft, ultimately enhancing the safety and operational capabilities of these vital systems.