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MOBIL GREASE 28

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Individual (13.4oz Tube) Case of 4 Case of 40 Tubes 5 Gallon
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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 300C, 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.

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 -54C to 177C (-65F to 350F) 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 177C (350F), 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.

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Reviews

I use Mobil 28 in every bearing and fitting on my 269 helicopters. The oil runs out out of the grease during times of extended inactivity but otherwise it’s exceptional!

Monadnock C Verified Purchase

EXXON MOBIL GREASE 28 98JF51 TUBE

September 16, 2021

Dale F Verified Purchase

EXXON MOBIL GREASE 28 5 GAL

July 21, 2021

Great all around grease. Can’t go wrong.

Alaska S Verified Purchase

EXXON MOBIL GREASE 28 98JF51 TUBE

June 13, 2021

Quick and easy. Correct product.

Terry P Verified Purchase

EXXON MOBIL GREASE 28 98JF51 TUBE

June 10, 2021

excellent product

Dale F Verified Purchase

EXXON MOBIL GREASE 28 5 GAL

June 7, 2021

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

Peter E
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.

Gloria
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.

Paul
July 8, 2020

ordered , received , wasnt smashed exactly what i needed

Tj
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.

Anton.v
March 2, 2019

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.

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.

Q: What size is the tube of Mobil grease 28?

13.4 oz tube.

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