Aircraft Spruce & Specialty Co.
Contact Us
Call Us
Sign In
- Photo may represent series and not specific product
- SHARE
Exxon Mobil Grease 28 98JF51 Tube
FREE Shipping
Overview
|
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. |
 |
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. |
Features
- 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.
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.
Documents
- SDS (PDF)
- Data Sheet (PDF)
Reviews
Used to re-grease gears/needle bearings inside of eMTB motor because gears are both metal and nylon and this grease is ideal for those applications.
Verified Purchase
Exxon Mobil Grease 28 98JF51 Tube
Just what I ordered. Fast shipment
Verified Purchase
Exxon Mobil Grease 28 98JF51 Tube
Can’t beat it good stuff
Verified Purchase
Exxon Mobil Grease 28 98JF51 Tube
The Mobil 28 grease is used for the Bafang mid drive 750 watt e-bike motor as it has a nylon gear. This grease is well known all over the world in the bafang mid-drive motors community.
Verified Purchase
Exxon Mobil Grease 28 98JF51 Tube
Does what it says on the label
Verified Purchase
Exxon Mobil Grease 28 98JF51 Tube
Excellent product. Shipped quickly
Verified Purchase
Exxon Mobil Grease 28 98JF51 Tube
Verified Purchase
Exxon Mobil Grease 28 98JF51 Tube
the correct greese is alwasys the best.
Verified Purchase
Exxon Mobil Grease 28 98JF51 Tube
Great service was shipped in a timely fashion. I needed isoflex comparable grease, was a cost effective alternative. Thank you!
Verified Purchase
Exxon Mobil Grease 28 98JF51 Tube
Ideal one airframe grease for single engine GA aircraft. Works from wheel bearings to jack screws. Low water washout is great for exposed landing gear bearings.
Q&A
Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
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.
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.
13.4 oz tube.
Yes, it does.
The color of Mobil Grease 28 is dark red.
