Mobil 33 Aviation Grease MIL-PRF-23827

Mobilgrease 33 is a high-performance synthetic aviation grease formulated with a polyalphaolefin (PAO) base oil and advanced additives for demanding aircraft lubrication applications. It provides low-temperature mobility, high-temperature stability, wear protection, corrosion and rust protection, water resistance, and high load-carrying capability.

Mobilgrease 33 is a multipurpose aviation grease intended for highly loaded anti-friction bearings, gears, actuators, instruments, high-speed bearings, and general airframe lubrication. It is qualified for applications specifying MIL-PRF-23827 Type I and is also associated with Boeing BMS 3-33C Type 1, Airbus AIMS 09-06-002, SAE AMS3052, and NATO G-354.

Important: Mobilgrease 33 is not recommended for aircraft wheel bearings. Always follow the aircraft, component, or equipment manufacturer's current maintenance documentation when selecting or substituting aviation grease.

Features and Benefits

• PAO synthetic base oil provides excellent low-temperature mobility and pumpability.
• Wide operating temperature range from -100°F to 250°F (-73°C to 121°C).
• Low starting and running torque supports aircraft operation in extremely cold environments.
• Excellent wear protection helps protect bearings, gears, actuators, and other aircraft components.
• High load-carrying capability provides protection under heavy and shock-loading conditions.
• Thermal and oxidative stability helps extend lubricant and component service life.
• Water resistance helps maintain grease performance during adverse weather and water exposure.
• Low volatility helps reduce base-oil loss during service.
• 10-year shelf life supports long-term aviation inventory management when stored appropriately and unopened.

Aircraft Applications

Mobilgrease 33 is designed as a multipurpose aviation grease for aircraft components requiring reliable lubrication across a very wide temperature range.

• Highly loaded anti-friction bearings
• Aircraft gears
• Actuators and actuator screws
• Aircraft instruments
• High-speed bearings
• General airframe lubrication
• Aircraft mechanisms requiring low-temperature grease performance

Mobilgrease 33 is not recommended for aircraft wheel bearings. For wheel-bearing applications, verify the aircraft manufacturer's specified lubricant and consider an aviation grease specifically approved for wheel bearings.

Specifications and Approvals

ExxonMobil identifies Mobilgrease 33 as being listed in the qualified products lists of Airbus, Boeing, and the U.S. military for applicable specifications. Verify the current aircraft or component maintenance documentation before use.

Typical Product Properties

The values shown are typical properties and are not product specifications. Refer to the current manufacturer documentation for applicable product specifications and acceptance requirements.

Storage and Shelf Life

Mobilgrease 33 has a 10-year shelf life when stored appropriately and unopened. Proper storage helps maintain grease structure and product performance during extended inventory periods.

Keep the cartridge clean and protected from contamination. Once a grease container is opened, the original shelf-life recommendation may no longer apply. Follow the manufacturer's current storage and handling recommendations.

Product Information

Frequently Asked Questions

What is Mobilgrease 33 used for?

Mobilgrease 33 is a multipurpose aviation grease used for highly loaded anti-friction bearings, aircraft gears, actuators, instruments, high-speed bearings, and general airframe lubrication.

What specification does Mobilgrease 33 meet?

Mobilgrease 33 is qualified for MIL-PRF-23827C Type I applications and is also identified by ExxonMobil for Boeing BMS 3-33C Type 1, Airbus AIMS 09-06-002, SAE AMS3052, and NATO G-354.

What is the temperature range of Mobilgrease 33?

Mobilgrease 33 has an operating temperature range of approximately -100°F to 250°F (-73°C to 121°C).

Can Mobilgrease 33 be used for aircraft wheel bearings?

Mobilgrease 33 is not recommended for aircraft wheel bearings. Always check the aircraft or component manufacturer's maintenance documentation for the specified wheel-bearing grease.

Is Mobilgrease 33 a synthetic grease?

Yes. Mobilgrease 33 uses a synthetic polyalphaolefin (PAO) base oil, providing excellent low-temperature mobility and resistance to thermal and oxidative degradation.

What is the shelf life of Mobilgrease 33?

Mobilgrease 33 has a 10-year shelf life when stored appropriately and unopened.

Can Mobilgrease 33 replace another MIL-PRF-23827 grease?

Do not substitute aviation greases solely because they share the same general specification. Verify the aircraft, component, or equipment manufacturer's current approved lubricant and applicable specification before making a substitution.