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Mobilgrease™ 33

Inside component to an aircraft wing

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, BMS3-33 multipurpose airframe grease uniquely formulated with a proprietary blend of polyalphaolefin (PAO) base oils and lithium complex soap. Unlike other commercially available BMS3-33 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:

  • Help maximize inventory value with its 10-year shelf life

  • Help consolidate inventories and reduce costs with its approved use for a wide range of applications

  • Help maximize component life with its uniquely patented formulation

  • Provide exceptional structural stability in extreme conditions and in adverse environments

  • Offer exceptional performance at high and low temperatures

  • 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


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

Resistance to degradation by water (hydrolysis)

No risk of corrosion induced by acidic base oil degradation products

Low volatility

Little vulnerability to significant base oil loss by evaporation in service

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


Mobilgrease 33

Is Approved Against


Airbus AIMS09-06-002



Boeing BMS 3-33B Type 1



MIL-PRF-23827C, Amendment 2, Type I



NATO G-354







Typical Properties


Test Methods

MIL-PRF-23827 Type I Requirements

Mobilgrease 33 (1)

NLGI Grade



1 1/2

Thickener Type


Metallic Soap

Lithium Complex




Blue Green



Smooth, free from lumps and visual impurities




No rancid, perfume, or alcohol odor


Viscosity of Base Oil, cSt

ASTM D 445



at 40 ºC




at 100 ºC




Dropping Point, ºC (ºF)

ASTM D 2265

165 (329) min

255 (491)

Low Temp. Torque at -73ºC (-100ºF), Nm

DEF STAN 05-50 Part 62, ASTM D 1478





1.00 max


Running, after 1 Hr


0.10 max


Low Temp. Torque with 10% water at -73ºC (-100ºF), Nm

DEF STAN 05-50 Part 62, ASTM D 1478







Running, after 1 Hr




Penetration at 25ºC (77ºF), mm/10

DEF STAN 05-50 Part 63, ASTM D 217





200 min


60 Strokes Worked




100,000 Strokes Worked

FTM 313



Penetration, 100,000 Strokes Worked with 10% water, mm/10

DEF STAN 05-50 Part 63, ASTM D 217



Oil Separation, 30 Hrs at 100ºC, wt %

ASTM D 6184

5 max


Evaporation Loss, 22 Hrs at 100ºC, wt %

ASTM D 2595

2 max


Evaporation Loss, 500 Hrs at 121ºC, wt %

ASTM D 2595



Copper Strip Corrosion, 24 Hrs at 100ºC

ASTM D 4048

1b max


AMS4640 Al/Ni Bronze Corrosion, 24 Hrs at 100ºC

ASTM D 4048



Four Ball Wear, scar dia., 1200rpm/40kg/1hr/75ºC, mm

ASTM D 2266



Load Wear Index, kgf

ASTM D 2596

30 min


Weld Load, kgf

ASTM D 2596



Timken OK Load, lbf

ASTM D 2509



Rust Protection, 48 Hrs at 125ºF, ›1mm dia Spots

ASTM D 1743

0 in 2 out of 3 bearings


SKF EMCOR Rust, 3% NaCl, rating

ASTM D 6138



Water Washout, 1 Hr at 38ºC (100 ºF), wt %

ASTM D 1264

20 max


Water Washout, 1 Hr at 79ºC (174 ºF), wt %

ASTM D 1264



High Temperature Performance, Hrs at 121ºC

ASTM D 3336

1,000 min


Oxidation Stability, pressure drop in kPa

ASTM D 942



100 Hrs at 99ºC


70 max


500 Hrs at 99ºC


105 max


Fretting Wear, mg loss

ASTM D 4170



Dynamic Bearing Life, No of cycles

BMS 3-33-8.2



Navy Gear Wear Test, mg loss/1000 cycles

FTM 335



2.3 kg load


2.5 max


4.5 kg load


3.5 max


Dirt Count, Particles/mL

FTM 3005



25-74 Micron Size


1000 max


75 Micron or Larger




Storage Stability, 6 months at 40ºC, Penetration, mm/10

FTM 3467




ASTM D 217

200 min


60x worked

ASTM D 217



60x worked, Difference from Unworked

ASTM D 217



Difference from Original

ASTM D 217



Elastomer Compatibility, 168 Hrs at 70ºC, % vol change

FTM 3603



Nitrile (NBR-L, AMS3217/2)




Thermoplastic Compatibility, 70 Hrs at 100ºC, % vol change

ASTM D 4289



Hytrel 6356 + 0.5% carbon black




Delrin 100 AF (ASTM D 4181)




PTFE (Teflon) (AMS 3652)




Nylatron GS




(1) Values may vary within modest ranges





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 BMS 3-33B Type 1
  • MIL-PRF-23827C, Amendment 2, Type I
  • NATO G-354
  • SAE AMS3052
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