Mobil grease 28 is a supreme performance, wide-temperature, antiwear grease designed to combine the unique features of a polyalphaolefin (PAO) synthetic base fluid with an organo-clay (non-soap) thickener. Its consistency is between an NLGI No. 1 and No. 2 grease. It offers outstanding performance over a wide temperature range. The wax-free nature of the synthetic base fluid, together with its high viscosity index compared to mineral oils, provide excellent low temperature pumpability, very low starting and running torque, and can help reduce operating temperatures in the load zone of rolling element bearings.
The clay thickener gives Mobil grease 28 a high dropping point value of around 300°C, which provides excellent stability at high temperatures. Mobil grease 28 resists water washing, provides superior load-carrying ability, reduces frictional drag, and prevents excessive wear. Tests show that Mobil grease 28 lubricates effectively rolling element bearings under conditions of high speeds and temperatures. Mobil grease 28 has also shown excellent ability to lubricate heavily loaded sliding mechanisms, such as wing flap screw jacks.
For more than 30 years, Mobil grease 28 has been the multi-purpose grease of choice for military and related aviation applications, worldwide.
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 Mobil grease 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.
Mobil grease 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.
pprovals/References/SpecificationATO Specification: -3952S Military Specification: LGI Grade 1S Military Specification: OD-G-24508A, Amendment 4S Military Specification: IL-G-81322 Grade BS Military Specification: IL-PRF-81322G
Alternate PN#s: 201550402020 970934 MOBILGREASE 28
Pilatus PN/Spec#: 908.21.02.103
DOD Spec#: DOD-G-24508A, Amendment 4 Quality Level
NLGI Spec#: 2