BEACON 325 is a member of the Mobil brand of lubricating products recognized for their high quality and reliability, as well as performance capabilities. As with other Mobil greases, this product is manufactured to the strictest quality standards. A key feature of BEACON 325 is its use of a synthetic fluid to provide optimum performance for low temperature precision applications. BEACON 325 offers the following quality features:

  • Special synthetic base oil provides excellent low-torque and low temperature properties
  • Excellent oxidation stability for extended grease life needed for filled for life applications
  • Very good water resistance ensures proper lubrication even in the presence of incidental water contamination
  • Low volatility base oil permits operation at moderate to high temperature without fluid evaporation


Application notes: BEACON 325 is formulated with an organic ester synthetic oil. This synthetic oil may cause a softening or swelling of certain plastics, elastomers, paints, or varnishes. How serious the softening or swelling tendency may be depends also on the temperature and the period of contact. Contact your local ExxonMobil lubricants representative for further information on materials compatibility.

BEACON 325 provides excellent service in a wide variety of small bearings and lightly loaded gears that operate over a wide temperature range, including such applications as:

  • Naval, marine, and aircraft instruments and control mechanisms
  • Geared limit switches in Limitorque valve actuators
  • Commercial and military electronic equipment
  • Sealed for life motors, generators, and similar equipment in automotive, aviation and industrial applications


Beacon 325 meets or exceeds the requirements of:  
DIN 51825 KE1-2-50

Typical Properties

  Beacon 325
NLGI Grade 2
Thickener Type Lithium
Color, Visual Tan
Penetration, Worked, 25 ºC, ASTM D 217 285
Dropping Point, ºC, ASTM D 2265 180
Viscosity of Oil, ASTM D 445 cSt@40º C 12
Apparent Viscosity, ASTM D 1092  
@ 20sec-¹ and -40º C, Poise 7,000
@ 50sec-¹ and -40º C, Poise 3,500
Oil Separation, FTMS 791B321.3, 30 hrs @ 100º C, mass % 4
Corrosion Prevention, ASTM D 1743 Pass


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Is this safe for use with Buna O-rings? Can this be used in place of Mobile 28?
Sarah L on Jan 7, 2019

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.