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:

  • calendar 10 icon

    Help maximize inventory value with its 10-year shelf life

  • reduce costs blue icon

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

  • component life blue icon

    Help maximize component life with its uniquely patented formulation

  • structural stability blue icon

    Provide exceptional structural stability in extreme conditions and in adverse environments

  • exceptional performance icon

    Offer exceptional performance at high and low temperatures

  • offensive odor icon

    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

Lithium Complex Grease Compatibility | ExxonMobil Aviation

Learn best practices for converting to Mobilgrease™ 33 grease.

Technical topics

Low Viscosity Oil Separation and Bleed| ExxonMobil™ aviation

Learn what causes oil bleed and grease separation, how to identify what is normal and what is excessive, and how to minimize separation.

Technical topics

Aviation Grease Compatibility Guidance | ExxonMobil™ aviation

Learn what grease compatibility is, and how it impacts grease conversion and performance.

Technical topics

Using FIFO Inventory Method | ExxonMobil™ aviation

Learn what grease compatibility is, and how it impacts grease conversion and performance.

Technical topics

All Mobilgrease 33 resources

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

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

 

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

This product has the following approvals:

AIRBUS AIMS 09-06-002

BOEING BMS 3-33B, Type 1

MIL-PRF-23827C

NATO G-354

 

This product meets or exceeds the requirements of:

SAE AMS3052

 

Properties and Specifications

Property

Grade

NLGI 1.5

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

PASS

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

3.2

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

12.5

Boeing Dynamic Bearing Life, cycles, BMS 3-33

PASS

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

11

Color, Visual

Blue Green

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

1B

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

0

Dirt, # particles 75u or larger, FTM 3005

0

Dropping Point, °C, ASTM D2265

255

EMCOR Rust, 3% NaCl, IP 220

0,0

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

1

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

8.7

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

700

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

0.4

Fretting Wear, mg, ASTM D4170

0.6

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

1.1

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

1.6

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

2,200+

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

110

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

12.6

Odor, OLFACTORY

PASS

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

4

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

25

Penetration, 60X, 0.1 mm, ASTM D217

292

Penetration, Unworked, 0.1 mm, ASTM D217

285

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

0,0,0

Texture/Consistency, VISUAL

PASS

Timken OK Load, lb, ASTM D2509

55

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

3

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

6

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

330

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

0.52

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

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