Mobil Jet II Turbine Oil, MIL-PRF-23699F-STD

Key Features

• 5 cSt synthetic aircraft turbine oil
• MIL-PRF-23699F STD Standard Performance classification
• SAE AS5780 SPC Standard Performance Capability classification
• Excellent thermal stability
• Excellent oxidative stability
• Helps resist deterioration and deposit formation
• Excellent resistance to foaming
• Wear and corrosion protection
• Good high- and low-temperature viscosity characteristics
• Compatible with metals commonly used in gas turbine construction
• Compatible with specified Viton, Buna-N, and silicone seal materials

Aircraft and Turbine Applications

Mobil Jet Oil II is recommended for aircraft-type gas turbine engines requiring a MIL-PRF-23699 STD / SAE AS5780 SPC lubricant.

• Turbojet engines
• Turbofan engines
• Turboprop engines
• Turboshaft engines
• Helicopter turbine engines
• Aircraft auxiliary power units
• Constant-speed drives
• Integrated-drive generators
• Aircraft-type gas turbines used in industrial applications
• Aircraft-type gas turbines used in marine applications

Important: Specific engine or equipment approval must be verified against the applicable manufacturer's technical documentation. Do not select or substitute turbine oil solely on the basis of viscosity or specification classification.

Specifications and Approvals

Builder Approvals

ExxonMobil lists Mobil Jet Oil II as having builder approvals covering engines and accessories from major aviation manufacturers, including CFM International, General Electric, International Aero Engines, Pratt & Whitney, Pratt & Whitney Canada, Rolls-Royce, Honeywell, and Turbomeca.

Always verify specific engine or equipment applicability with the aircraft or equipment builder. An OEM approval listed for a product does not mean that the oil is approved for every engine or component produced by that manufacturer.

Typical Physical Properties

The following values are typical properties published by ExxonMobil for Mobil Jet Oil II. They are provided for technical reference and should not be interpreted as guaranteed shipment specifications.

Operating Temperature Range

Mobil Jet Oil II has an effective operating range of approximately -40°F to 400°F (-40°C to 204°C). Its formulation is designed to provide thermal and oxidative stability while maintaining appropriate viscosity across a wide range of aircraft gas turbine operating conditions.

Deposit, Wear and Corrosion Protection

Mobil Jet Oil II is formulated to resist deterioration and deposit formation in both liquid and vapor phases. Its additive system also provides wear and corrosion protection for turbine engine components while maintaining excellent resistance to foaming.

The product is compatible with metals used in gas turbine construction as well as specified F Rubber (Viton A), H Rubber (Buna-N), and silicone seal materials.

Packaging and Shelf Life

Important shelf-life note: ExxonMobil's recommended shelf-life periods apply to unopened containers. Once a container is opened, ExxonMobil recommends using the product as soon as possible to minimize contamination and degradation; the stated shelf life no longer applies.

Mobil Jet Oil II vs. Mobil Jet Oil 254

Mobil Jet Oil II and Mobil Jet Oil 254 are both synthetic 5 cSt aircraft turbine oils, but they occupy different MIL-PRF-23699 and SAE AS5780 performance classifications. Mobil Jet Oil II is the STD/SPC product, while Mobil Jet Oil 254 is the HTS/HPC product.

The two products should not be treated as interchangeable simply because both are 5 cSt turbine oils. Always use the lubricant specified by the applicable aircraft, engine, accessory, or component maintenance documentation.

Frequently Asked Questions

What is Mobil Jet Oil II?

Mobil Jet Oil II is a 5 cSt synthetic aircraft gas turbine lubricant designed for commercial and military aviation applications. It is approved against the MIL-PRF-23699F STD classification and SAE AS5780 SPC.

What specification does Mobil Jet Oil II meet?

Mobil Jet Oil II is approved against MIL-PRF-23699F STD and has PRI-QPL-AS5780/SPC approval.

What viscosity is Mobil Jet Oil II?

Mobil Jet Oil II is a 5 cSt class turbine oil. Its published kinematic viscosity is 5.1 mm²/s at 100°C.

Is Mobil Jet Oil II an HTS turbine oil?

No. Mobil Jet Oil II is the Standard Performance (STD) product under MIL-PRF-23699 and the Standard Performance Capability (SPC) product under SAE AS5780. Mobil Jet Oil 254 is the Mobil HTS/HPC product.

What is the difference between Mobil Jet Oil II and Mobil Jet Oil 254?

Both are 5 cSt synthetic aircraft turbine oils, but Mobil Jet Oil II is classified as MIL-PRF-23699 STD / SAE AS5780 SPC, while Mobil Jet Oil 254 is classified as MIL-PRF-23699 HTS / SAE AS5780 HPC.

What aircraft engines use Mobil Jet Oil II?

ExxonMobil lists builder approvals covering engines from manufacturers including CFM International, GE, IAE, Pratt & Whitney, Pratt & Whitney Canada, Rolls-Royce, Honeywell, and Turbomeca. Specific engine applicability should always be verified with the applicable builder documentation.

What is the operating temperature range of Mobil Jet Oil II?

ExxonMobil identifies an effective operating range of approximately -40°F to 400°F (-40°C to 204°C).

What is the shelf life of Mobil Jet Oil II?

ExxonMobil recommends 10 years for unopened quart containers, 5 years for unopened pails and drums, and 2 years for unopened totes. Once a container is opened, the stated shelf life no longer applies.