Mobilgrease 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 Mobilgrease 28 a high dropping point value of around 300ºC, which provides excellent stability at high temperatures. Mobilgrease 28 resists water washing, provides superior load-carrying ability, reduces frictional drag, and prevents excessive wear. Tests show that Mobilgrease 28 lubricates effectively rolling element bearings under conditions of high speeds and temperatures. Mobilgrease 28 has also shown excellent ability to lubricate heavily loaded sliding mechanisms, such as wing flap screw jacks.
For more than 30 years, Mobilgrease 28 has been the multi-purpose grease of choice for military and related aviation applications, worldwide.
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. It meets the quality level of DOD-G-24508A, Amendment 4.
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 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.
Great product. Using it on the clutch and wheel bearings of my atv. If it’s good enough for aircraft wheel bearings, it’s better than good for an atv
April 12, 2021
My dad was a mechanic who also had his pilots license. He went with Mobils synthetic products as soon as they were on the market so I refuse to go with anything else. I actually ordered Mobilegrease 28 to go on the nylon gear in a vintage mechanical sewing machine as well as on his mothers old 100% metal treadle one. Im sure I wont be disappointed. Owners of electric bikes posted that it was the only grease product to use on nylon gears. Aircraft Spruces service was very prompt and the item was packaged well and it arrived safely. I am pleased.
December 16, 2020
This was my first order and everything was excellent. Best price I could find. I got a tracking number and my order the same week.
July 8, 2020
ordered , received , wasnt smashed exactly what i needed
February 22, 2020
Very satisfied with this product, even outperform my expectation. Low-temperature torque grease with excellent washout resistance. Fast delivery, instant feedback, professional packaging. Definitely, recommend Aircraft Spruce to trade with them.
March 2, 2019
Great product, great price and fast delivery!
April 29, 2018
Best pricing I could find. Super fast delivery too! We will be a repeat customer for sure.
March 6, 2017
Only 4 stars because I have not used it yet, but 4 stars for the price and speed of free delivery.
Q: How does this Mobil Grease 28 compare to Mobil SHC-100 (recommended to me by my A&P)? Thanks!
Per the supplier: Mobilgrease 28 uses an ISO 32 VG oil in a clay based thickener. Mobilith SHC 100 uses an ISO 100 VG oil (heavier, or thicker, than an ISO 32) in a lithium thickener. Lithium and clay thickeners are not compatible and should not be mixed.
Q: Are there any compatibility issues with mixing a micro gel thickened grease such as Aeroshell 5 with this grease?
Per Vendor: There have been no tests regarding if Mobil Grease 28 has any issues with mixing with a micro gel thickened grease such as Aeroshell 5.