Mobilgrease™ 28
Trusted for more than 50 years
Mobilgrease 28 grease – the first synthetic product Mobil™ offered – has been trusted for more than 50 years. With a 10-year shelf life, it offers more than three times the life of similar-type competitive greases.
Mobilgrease 28 is the polyalphaolefin (PAO), clay-based multipurpose airframe and wheel bearing grease of choice for many aircraft operators around the world. It is designed to lubricate plain and rolling bearings at low to high speeds, and splines, screws, worm gears and other mechanisms where high-friction reduction, low-wear and low-lubricant friction losses are required.
It meets the performance requirements of key military and commercial aviation specifications and offers operators increased flexibility and potential inventory consolidation benefits. Mobilgrease 28 grease is fully approved for use in multipurpose airframe grease applications and in wheel bearings.
Main Applications, Features and Benefits
Specifications, Approvals & Recommendations
Typical Characteristics
Product Data Sheet & MSDS
Features and Benefits
A particular requirement of aviation greases is the need to resist high temperature stresses, while providing excellent starting and low torque at low-temperature. To meet this combination of needs ExxonMobil product formulation scientists chose synthetic hydrocarbon base oils for Mobilgrease 28 because of their low volatility, exceptional thermal/oxidative resistance, and superb low-temperature capability. Formulators chose specific thickener chemistry and a proprietary additive combination which helps maximize the benefits of the synthetic base oils.
Mobilgrease 28 meets the requirements of key military and commercial aviation specifications and has built up a superb reputation for performance and reliability among users around the world.
Mobilgrease 28 provides the following advantages and potential benefits:
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Features |
Advantages and Potential Benefits |
|
High viscosity index (VI) synthetic base stock with no wax content |
Allows wide operating temperature range - outstanding high and low temperature performance Provides thicker fluid films protecting against wear of equipment parts operating at high temperature Causes low resistance during start-up at very low temperatures |
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Excellent protection against wear and corrosion |
Superb bearing protection and helps extend bearing life and reduce bearing replacement costs |
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Extreme-pressure protection characteristics |
Avoids excessive wear, even under shock load |
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High thermal/oxidative stability |
Long relubrication intervals |
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High resistance to water washout |
Maintains excellent grease performance in adverse weather and other water-exposure conditions |
Applications
Mobilgrease 28 is designed for the lubrication of plain and rolling bearings at low to high speeds, and splines, screws, worm gears, and other mechanisms where high friction reduction, low wear, and low lubricant friction losses are required. The recommended operating temperature range is -54ºC to 177ºC (-65ºF to 350ºF) with appropriate relubrication intervals.
Mobilgrease 28 is recommended for use in landing wheel assemblies, control systems and actuators, screw jacks, servo devices, sealed-bearing motors, oscillating bearings, and helicopter rotor bearings on military and civil aircraft. Subject to equipment manufacturer approvals, it can also be used on naval shipboard auxiliary machinery and where superseded specifications MIL-G-81322 (WP), MIL-G-7711A, MIL-G-3545B, and MIL-G-25760A are recommended.
Mobilgrease 28 is also recommended for industrial lubrication, including sealed or repackable ball and roller bearings wherever extreme temperature conditions, high speeds, or water washing resistance are factors. Typical industrial applications include conveyor bearings, small alternator bearings operating at temperatures near 177ºC (350ºF), high-speed miniature ball bearings, and bearing applications where oscillatory motion, and vibration create problems.
Mobilgrease 28 is qualified by the U.S. Military under Specification MIL-PRF-81322, General-Purpose, Aircraft, and Specification DOD-G-24508A (Navy) for shipboard auxiliary machinery. It is a U.S. Military Symbol WTR and NATO Code Number G-395 grease.
