Mobilgrease 33

ExxonMobil aviation , Norway

Synthetic Aviation Grease

Product Description

Mobilgrease 33 is a high-performance lithium-complex grease designed for general-purpose aircraft use. Its consistency is between the NLGI grades 1 and 2. Mobilgrease 33 utilizes a 100% polyalphaolefin base oil and premium additives which ensure outstanding lubrication performance over a wide temperature range and operating conditions.


Features and Benefits

The lithium complex thickener system provides excellent structural stability and resistance to water wash-out. Polyalphaolefin base oil is used in Mobilgrease 33 because of its exceptional thermal/oxidative resistance potential, low volatility, and superb low-temperature capability, without the potential vulnerability of an ester base oil to degradation from reaction with water. The synthetic polyalphaolefin base oil offers excellent low-temperature mobility/pumpability and very low starting and running torque values. In addition, the state-of-the art additive system in Mobilgrease 33 provides superior rust and wear protection and load-carrying capacity compared to aviation greases that meet the minimum requirements of the MIL-PRF-23827 specification.


Mobilgrease 33, with its unique features, provides the following advantages and potential benefits:



Advantages and Potential Benefits

High viscosity index polyalphaolefin basestock

Very wide operating temperature range - outstanding high and low temperature performance.

Excellent lubricant film protection at high temperatures

Good storage stability

Grease structure integrity maintained - low oil separation

Exceptional resistance to thermal and oxidative degradation

Long grease and lubricated part service life

Low volatility

Little vulnerability to significant base oil loss by evaporation in service

Resistance to degradation by water (hydrolysis)

No risk of corrosion induced by acidic base oil degradation products

Excellent protection against wear, corrosion, and rusting

Excellent bearing and component protection

Extreme-pressure characteristics

Prevention of excessive wear, even under shock load

High resistance to water washout

Excellent grease performance in adverse weather and other water-exposure conditions



Mobilgrease 33 is a true multipurpose aviation grease intended for use in highly loaded anti-friction bearings, gears, and actuators as well as instruments, high speed bearings (though not recommended for wheel bearings), and general airframe lubrication, over operating temperatures from –100ºF to 250ºF (–73ºC to 121ºC). It can be used in all applications for which the aircraft manufacturer specifies U.S. Military Specification MIL-PRF-23827, Type I (Grease, Aircraft and Instrument, Gear and Actuator Screw, Grease thickened with metallic soap), Boeing BMS 3-33B (Grease, Aircraft, General Purpose), and Airbus AIMS09-06-002/SAE AMS3052 (Grease, General Purpose, Airframe, Low Temperature Range, Lithium Thickened).  Mobilgrease 33 is listed in the Qualified Products List of Airbus, Boeing, and the U.S. Military for these specifications. The NATO Code Number for Mobilgrease 33 is G-354.


Specifications and Approvals

This product has the following approvals:

AIRBUS AIMS 09-06-002

BOEING BMS 3-33B, Type 1


NATO G-354


This product meets or exceeds the requirements of:



Properties and Specifications



NLGI 1.5

Al/Ni Bronze Corrosiveness, 24 h, 100 C, Rating, SAE AMS3058 3.2.7.b


Base Oil Viscosity of Greases @ 100 C, mm2/s, AMS 1700


Base Oil Viscosity of Greases @ 40 C, mm2/s, AMS 1697


Boeing Dynamic Bearing Life, cycles, BMS 3-33


Bomb Oxidation, Pressure Drop, 100 h, kPa, ASTM D942


Color, Visual

Blue Green

Copper Strip Corrosion, 24 h, 100 C, Rating, ASTM D4048


Dirt, # particles 25u to 74 u, FTM 3005


Dirt, # particles 75u or larger, FTM 3005


Dropping Point, °C, ASTM D2265


EMCOR Rust, 3% NaCl, IP 220


Evaporation Loss, 22 h, 100 C, mass%, ASTM D2595


Evaporation Loss, 500 h, 121 C, mass %, ASTM D2595


Four-Ball Extreme Pressure Test, Weld Load, kgf, ASTM D2596


Four-Ball Wear Test, Scar Diameter, mm, ASTM D2266


Fretting Wear, mg, ASTM D4170


Gear Wear Test, 2.3 kg load, 1000 cycles, gear wt loss, mg, FTM 335 (mod)


Gear Wear Test, 4.5 kg load, 1000 cycles, gear wt loss, mg, FTM 335 (mod)


High Temperature Performance, Hrs at 121 C, h, ASTM D3336


Load Carrying Capacity, Load-Wear Index, kgf, ASTM D2596


NBR-L, AMS 3217/2 Compat, 70C 158 h, vol %, FTM 3603




Oil Separation, 30 h @ 100 C, mass%, ASTM D6184


Oxidation Stability, Pressure Drop, 500 h, kPa, ASTM D942


Penetration, 60X, 0.1 mm, ASTM D217


Penetration, Unworked, 0.1 mm, ASTM D217


Rust Protection, 48 h @ 125 F, Rating, ASTM D1743


Texture/Consistency, VISUAL


Timken OK Load, lb, ASTM D2509


Water Washout, Loss @ 38 C, wt%, ASTM D1264


Water Washout, Loss @ 79 C, wt%, ASTM D1264


Pen Worked X 100,000, 1/16" holes, 0.1 mm, FTM 313


Low Temperature Torque, Starting @ -73 C, Nm, ASTM D1478


Low Temperature Torque, Running @ -73 C, Nm, ASTM D1478



Health and safety

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

All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries unless indicated otherwise.


Toute l'attention possible a été portée à la préparation de cette Fiche. Sous réserve des lois et réglements localement applicables, toutes garanties juridiques expresses ou implicites, quant à la précision de l'information sont exclues, et toute responsabilité concernant l'exactitude et l'exhaustivité de l'information est déclinée.

Due to continual product research and development, the information contained herein is subject to change without notification.  Typical Properties may vary slightly.