Mobilgrease™ 33
Ester-free and offensive odor-free
With a 10-year shelf life – offering more than three times the life of similar-type competitive greases – Mobilgrease 33 grease helps our partners optimize their shelf-life management programs, enabling potential cost savings.
Mobilgrease 33 is a high-performance, BMS3-33C multipurpose airframe grease uniquely formulated with a proprietary blend of polyalphaolefin (PAO) base oils and lithium complex soap. Unlike other commercially available BMS3-33C greases, this unique formulation is ester-free, providing superior performance and hydrolytic stability, excellent resistance to thermal and oxidative degradation and exceptional wear protection in heavy loaded pressure environments without an offensive odor. Our ester-free blend offers exceptional performance in wet environments to resist water washout and evaporation loss, protecting the grease from the deteriorating effects of hydrolysis.
Why trust in Mobilgrease 33 aviation grease? Because it’s been specifically formulated to:
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Help maximize inventory value with its 10-year shelf life
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Help consolidate inventories and reduce costs with its approved use for a wide range of applications
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Help maximize component life with its uniquely patented formulation
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Provide exceptional structural stability in extreme conditions and in adverse environments
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Offer exceptional performance at high and low temperatures
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Have no offensive odor
Common grease point applications
- Outboard and inboard flaps
- Outboard and inboard slats
- Ground/flight spoilers
- Elevators and stabilizers
- Landing gear bushings
- Rudders
- Ailerons
Product information
Data sheets
Technical Resources
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Lithium Complex Grease Compatibility | ExxonMobil AviationLearn best practices for converting to Mobilgrease™ 33 grease.
Technical topics
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Aviation Grease Compatibility Guidance | ExxonMobil™ aviationLearn what grease compatibility is, and how it impacts grease conversion and performance.
Technical topics
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Using FIFO Inventory Method | ExxonMobil™ aviationLearn what grease compatibility is, and how it impacts grease conversion and performance.
Technical topics
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Low Viscosity Oil Separation and Bleed| ExxonMobil™ aviationLearn what causes oil bleed and grease separation, how to identify what is normal and what is excessive, and how to minimize separation.
Technical topics
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:
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Features |
Advantages and Potential Benefits |
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High viscosity index polyalphaolefin basestock |
Very wide operating temperature range - outstanding high and low temperature performance. Excellent lubricant film protection at high temperatures |
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Good storage stability |
Grease structure integrity maintained - low oil separation |
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Exceptional resistance to thermal and oxidative degradation |
Long grease and lubricated part service life |
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Low volatility |
Little vulnerability to significant base oil loss by evaporation in service |
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Resistance to degradation by water (hydrolysis) |
No risk of corrosion induced by acidic base oil degradation products |
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Excellent protection against wear, corrosion, and rusting |
Excellent bearing and component protection |
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Extreme-pressure characteristics |
Prevention of excessive wear, even under shock load |
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High resistance to water washout |
Excellent grease performance in adverse weather and other water-exposure conditions |
Applications
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 3-33C (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
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This product has the following approvals: |
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AIRBUS AIMS 09-06-002 |
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BOEING BMS 3-33C Type 1 |
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MIL-PRF-23827C |
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NATO G-354 |
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This product meets or exceeds the requirements of: |
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SAE AMS3052 |
Properties and Specifications
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Property |
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Grade |
NLGI 1.5 |
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Al/Ni Bronze Corrosiveness, 24 h, 100 C, Rating, SAE AMS3058 3.2.7.b |
PASS |
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Base Oil Viscosity of Greases @ 100 C, mm2/s, AMS 1700 |
3.2 |
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Base Oil Viscosity of Greases @ 40 C, mm2/s, AMS 1697 |
12.5 |
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Boeing Dynamic Bearing Life, cycles, BMS 3-33 |
PASS |
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Bomb Oxidation, Pressure Drop, 100 h, kPa, ASTM D942 |
11 |
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Color, Visual |
Blue Green |
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Copper Strip Corrosion, 24 h, 100 C, Rating, ASTM D4048 |
1B |
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Dirt, # particles 25u to 74 u, FTM 3005 |
0 |
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Dirt, # particles 75u or larger, FTM 3005 |
0 |
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Dropping Point, °C, ASTM D2265 |
255 |
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EMCOR Rust, 3% NaCl, IP 220 |
0,0 |
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Evaporation Loss, 22 h, 100 C, mass%, ASTM D2595 |
1 |
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Evaporation Loss, 500 h, 121 C, mass %, ASTM D2595 |
8.7 |
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Four-Ball Extreme Pressure Test, Weld Load, kgf, ASTM D2596 |
700 |
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Four-Ball Wear Test, Scar Diameter, mm, ASTM D2266 |
0.4 |
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Fretting Wear, mg, ASTM D4170 |
0.6 |
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Gear Wear Test, 2.3 kg load, 1000 cycles, gear wt loss, mg, FTM 335 (mod) |
1.1 |
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Gear Wear Test, 4.5 kg load, 1000 cycles, gear wt loss, mg, FTM 335 (mod) |
1.6 |
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High Temperature Performance, Hrs at 121 C, h, ASTM D3336 |
2,200+ |
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Load Carrying Capacity, Load-Wear Index, kgf, ASTM D2596 |
110 |
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NBR-L, AMS 3217/2 Compat, 70C 158 h, vol %, FTM 3603 |
12.6 |
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Odor, OLFACTORY |
PASS |
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Oil Separation, 30 h @ 100 C, mass%, ASTM D6184 |
4 |
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Oxidation Stability, Pressure Drop, 500 h, kPa, ASTM D942 |
25 |
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Penetration, 60X, 0.1 mm, ASTM D217 |
292 |
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Penetration, Unworked, 0.1 mm, ASTM D217 |
285 |
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Rust Protection, 48 h @ 125 F, Rating, ASTM D1743 |
0,0,0 |
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Texture/Consistency, VISUAL |
PASS |
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Timken OK Load, lb, ASTM D2509 |
55 |
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Water Washout, Loss @ 38 C, wt%, ASTM D1264 |
3 |
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Water Washout, Loss @ 79 C, wt%, ASTM D1264 |
6 |
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Pen Worked X 100,000, 1/16" holes, 0.1 mm, FTM 313 |
330 |
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Low Temperature Torque, Starting @ -73 C, Nm, ASTM D1478 |
0.52 |
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Low Temperature Torque, Running @ -73 C, Nm, ASTM D1478 |
0.06 |
Health and safety
Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @ http://www.msds.exxonmobil.com/psims/psims.aspx
- Airbus
- Boeing
- Maximize component life
- Resists degradation
- Extended temperature range
- High temperature stability
- Structural stability
- Water resistance
- Volatility
- Wear protection
- Rust protection
- Corrosion protection
- Friction control
- Load carrying capabilities
- Multi-purpose airframe grease
- Airbus AIMS09-06-002
- Boeing BMS3-33C Type 1
- MIL-PRF-23827C, Amendment 2, Type I
- NATO G-354
- SAE AMS3052
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