Mobil Beacon 325 (5 Gal. Pail)
Mobil Beacon 325 is a high performance synthetic grease specifically designed for precision equipment operating at moderate to low temperatures. It provides superb lubrication in a wide variety of small bearings and gears over a wide range of temperatures, and is an excellent choice as a gear and bearing lubricant in "sealed-for-life" units in aircraft, automotive and industrial applications. Due to its high viscosity index, it operates well at low temperatures and has good pumpability. It is also highly resistant to water, has extremely high oxidation stability, and good mechanical stability. The recommended temperature range for continuous operation is -50° C to 120°C.
Mobil Beacon 325 is formulated with an organic ester synthetic oil. See "Applications" below for notes.
Regarding the use with Buna O-rings, we are not certain. We always recommend using the lubricants recommended by your equipment manufacturer.
It is also not recommended for substitution with Mobilgrease 28. Mobil Beacon 325 has a lithium thickener and an ester synthetic base oil while Mobilgrease 28 has a clay-based thickener and a PAO synthetic base oil. Though these two greases have the same NLGI grade 1.5, they are are incompatible.