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MobilGrease 28 is an anti-wear aviation grease specially designed as a lubricant for plain and rolling bearings, and friction reduction.

Synthetic aviation grease MIL-G-81322D, DEF STAN 92-51/XG 293

  • Excellent resistance to water washout
  • Used in the extreme North
  • Durability of operational characteristics
  • Reduction of operating costs
  • For lubrication of various bearings
  • A wide range of operating temperatures - 55 ° C - 180 ° C
MobilGrease 28 is a high-performance anti-wear aviation grease that helps an aircraft run smoothly and be protected from wearing caused by friction. It is a wax-free mixture with the combined properties of an organo-clay (non-soap) thickener and a polyalphaolefin (PAO) synthetic base fluid. Widely used by the military, this aircraft grease has reduced heat build-up and low sliding friction which saves energy. It also has high water washout resistance making it the better choice of grease when facing extreme weather conditions.

MobilGrease 28 provides protection and resistance against excessive wear and high temperature stresses. Despite these, this aviation grease still provides great starting torque even at low temperatures. This combination of excellent properties was made possible by scientists from ExxonMobil. They chose the best synthetic base oils for Mobilgrease 28 based on their superb oxidative/thermal resistance, excellent low-temperature capability, and low volatility.

They combined a specific thickening mixture with the perfect additive blend to effectively utilize the properties of the synthetic base oils. Mobilgrease 28 is well-above the standard for essential commercial and military aviation specifications, and has an excellent reputation among users as a very reliable and high-performing aircraft grease. Its features are as follows:
  • Wax-free and has high viscosity index (VI) synthetic base stock
  • Enables operation even with a wide temperature range - from extremely high to extremely low
  • Provides sturdier fluid films as protection against the wearing of equipment parts during operations at high temperature
  • Reduces resistance at start-up even at very low temperatures
  • Effective protection against corrosion and wear
  • Helps in protection from extremely high pressure
  • Superb oxidative/thermal resistance
  • High water washout resistance
Mobilgrease 28 is recommended for control systems and actuators, landing wheel assemblies, servo devices, helicopter rotor bearings, oscillating bearings, and screw jacks. This aviation grease may be used on certain naval ships given the approval of the manufacturer. The recommended temperature range when operating using Mobilgrease 28 is from -54°C to 177°C (-65°F to 350°.F).

Buy and price

Mobilgrease 28 is available here at Trast Aero! We have a reliable logistics system that secures the delivery of your orders. We are a top distributor of high-class aviation engine oils and greases and we ship worldwide. We have professional staffs to provide you with the detailed information and the technical specifications of our products.

To buy MobilGrease 28, terms and conditions of purchase, please contact our Sales department. Price on request.


MobilGrease 28 datasheet

  Test Method Mobilgrease 28 MIL-PRF-81322 Limits
NLGI Grade   1 1/2  
Thickener Type   Clay (non-soap)  
Color Visual Dark Red  
Structure Visual Smooth, buttery  
Dropping Point, ºC (ºF) ASTM D 2265 315 (599) 232 (450) min
Viscosity of Base Oil, cSt ASTM D 445    
at 40ºC   29.3  
at 100ºC   5.6  
Low Temp. Torque at -54ºC (-65ºF), Nm (g-cm) ASTM D 1478    
Starting   0.83 (8500) 0.98 (10,000) max
Running, after 1 Hr   0.08 (800) 0.098 (1,000) max
Penetration @ 25ºC (77ºF), 60 Stoke Worked, mm/10 ASTM D 217 295 265-320
Extended Worked Penetration Stability, 100,000 Strokes, mm/10 FTM 313 302 350 max
Oil Separation, 30 Hrs at 177ºC, wt % ASTM D 6184 2.5 2.0 - 8.0
Evaporation Loss, 22 Hrs at 177ºC, wt % ASTM D 2595 6 10 max
Copper Strip Corrosion, 24 Hrs at 100ºC ASTM D 4048 Pass 1b max
Four-Ball Wear, Scar dia, mm ASTM D 2266 0.5 0.8 max
Load Wear Index, kgf ASTM D 2596 42 30 min
Rust Protection, 48 Hrs at 125ºF, › 1mm dia Corrosion Spots ASTM D 1743 Pass 0
Water Washout, 1 Hr at 41ºC, wt % ASTM D 1264 1 20 max
High Temperature Performance, Hrs at 177ºC ASTM D 3336 Pass 400 min
Oxidation Stability, pressure drop in kPa ASTM D 942    
100 Hrs at 99ºC   Pass 83 max
500 Hrs at 99ºC   Pass 172 max
Storage Stability, 6 months at 38ºC FTM 3467 Pass Pass
Dirt Count, Particles/mL FTM 3005    
25-74 Micron   Pass 1000 max
75 Micron or Larger   0 0
Oscillation Friction and Wear, Scar Dia, 35,000 cycles, 90º Angle, Aluminum Bronze Block, mm Modified ASTM D 3704 Pass 6.35 max
Rubber Swell, L Type Synthetic, 1 week at 70ºC (158ºF), vol % FTM 3603 6 10 max

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