Mobilgrease™ 33

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With more than a six-year shelf life, Mobilgrease™ 33 helps our partners optimize their shelf-life management programs, enabling potential cost savings.

Mobilgrease 33 is a high-performance, BMS3-33 multi-purpose 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, 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. 

Common grease point applications 

  • Outboard and inboard flaps
  • Outboard and inboard slats
  • Ground/flight spoilers
  • Elevators and stabilizers
  • Landing gear bushings
  • Rudders
  • Ailerons 

Reasons to trust in Mobilgrease 33 

  1. It offers two times the shelf life versus other commercially available greases, helping airlines maximize inventory value
  2. Mobilgrease 33 is approved for use in a wide range of applications, helping operators consolidate inventories and reduce costs
  3. Its uniquely patented formulation helps maximize component life
  4. Provides exceptional structural stability in extreme conditions and in adverse environments
  5. Offers exceptional performance at high and low temperatures
  6. Mobilgrease 33 lacks offensive odor and doesn’t cause skin irritation
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Product information

   Mobilgrease™ 33 performance profile 330.4 KB/pdf
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  • 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

Resources

Aviation lubricant shelf life

Find out the recommended shelf life of ExxonMobil aviation lubricants.

English, 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:


Features
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

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 3-33B (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
Meets
Airbus AIMS09-06-002 X

Boeing BMS 3-33B Type 1 X

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

NATO G-354 X

SAE AMS3052

X

Typical properties

Test Methods
MIL-PRF-23827 Type I Requirements
Mobilgrease 33 (1)
NLGI Grade

  

 

1 1/2
Thickener Type

Metallic Soap Lithium Complex
Color Visual

Blue Green
Structure/Consistency Visual Smooth, free from lumps and visual impurities Pass
Odor Olfactory No rancid, perfume, or alcohol odor Pass
Viscosity of Base Oil, cSt ASTM D 445

at 40 ºC

12.5
at 100 ºC

3.2
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

Starting

1.00 max 0.52
Running, after 1 Hr

0.10 max 0.06
Low Temp. Torque with 10% water at -73ºC (-100ºF), Nm DEF STAN 05-50 Part 62, ASTM D 1478

Starting

0.67
Penetration at 25ºC (77ºF), mm/10 DEF STAN 05-50 Part 63, ASTM D 217

Unworked

200 min 285
60 Strokes Worked

270-310 292
100,000 Strokes Worked FTM 313 270-375 330
Penetration, 100,000 Strokes Worked with 10% water, mm/10 DEF STAN 05-50 Part 63, ASTM D 217

330
Oil Separation, 30 Hrs at 100ºC, wt % ASTM D 6184 5 max 4
Evaporation Loss, 22 Hrs at 100ºC, wt % ASTM D 2595 2 max 1
Evaporation Loss, 500 Hrs at 121ºC, wt % ASTM D 2595

8.7
Copper Strip Corrosion, 24 Hrs at 100ºC ASTM D 4048 1b max 1b
AMS4640 Al/Ni Bronze Corrosion, 24 Hrs at 100ºC ASTM D 4048

Pass
Four Ball Wear, scar dia., 1200rpm/40kg/1hr/75ºC, mm ASTM D 2266

0.4
Load Wear Index, kgf ASTM D 2596 30 min 110
Weld Load, kgf ASTM D 2596

700
Timken OK Load, lbf ASTM D 2509

55
Rust Protection, 48 Hrs at 125ºF, ›1mm dia Spots ASTM D 1743 0 in 2 out of 3 bearings 0,0,0
SKF EMCOR Rust, 3% NaCl, rating ASTM D 6138

Water Washout, 1 Hr at 38ºC (100 ºF), wt % ASTM D 1264 20 max 3
Water Washout, 1 Hr at 79ºC (174 ºF), wt % ASTM D 1264

6
High Temperature Performance, Hrs at 121ºC ASTM D 3336 1,000 min 2,200+
Oxidation Stability, pressure drop in kPa ASTM D 942

100 Hrs at 99ºC

70 max 11
500 Hrs at 99ºC

105 max 25
Fretting Wear, mg loss ASTM D 4170

0.6
Dynamic Bearing Life, No of cycles BMS 3-33-8.2

Pass
Navy Gear Wear Test, mg loss/1000 cycles FTM 335

2.3 kg load

2.5 max 1.1
4.5 kg load

3.5 max 1.6
Dirt Count, Particles/mL FTM 3005

25-74 Micron Size

1000 max 0
75 Micron or Larger

0 0
Storage Stability, 6 months at 40ºC, Penetration, mm/10 FTM 3467

Unworked ASTM D 217 200 min 289
60x worked ASTM D 217

288
60x worked, Difference from Unworked ASTM D 217

1
Difference from Original ASTM D 217 ±30 2
Elastomer Compatibility, 168 Hrs at 70ºC, % vol change FTM 3603

Nitrile (NBR-L, AMS3217/2)

+12.6
Thermoplastic Compatibility, 70 Hrs at 100ºC, % vol change ASTM D 4289

Hytrel 6356 + 0.5% carbon black

3.4
Delrin 100 AF (ASTM D 4181)

+0.1
PTFE (Teflon) (AMS 3652)

+0.1
Nylatron GS

-0.5
(1) Values may vary within modest ranges



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