Mobil Centaur™ Moly Series

Premium calcium sulfonate greases

The Mobil Centaur Moly Series of greases are premium quality greases formulated with advanced calcium sulfonate thickener technology. The calcium sulfonate thickener in the Mobil Centaur Moly products represents a significant advance in grease formulation technology.

Unlike conventional soap-based thickeners (i.e., lithium, aluminum and calcium soaps), the calcium sulfonate thickener does much more than simply impart consistency. It imparts excellent corrosion and water-resistance properties to the grease and has inherent extreme-pressure protection properties that enhance load-carrying ability. Further, the EP properties derived from the calcium thickener also have inherently better thermal stability than those from conventional sulfur/phosphorus EP additives.

Fortified with 3 percent molybdenum disulfide to complement a robust extreme-pressure additive system, the Mobil Centaur Moly Series of greases are highly recommended for heavily loaded applications or environments highly contaminated with water, which include:

  • Heavy-duty trucks, including chassis, spring shackles, king pins, tie rods, U-joints, hinge and bucket pins, and fifth wheels
  • Mining and construction equipment
  • Marine equipment
  • Highly loaded industrial bearings

Mobil Centaur Moly Series greases also provide outstanding resistance against the effects of water washout, water spray-off and corrosion, and are available in NLGI 1 and 2 grades offering a range of pumpability and dispensing options.


Features and benefits

  • Excellent extreme-pressure protection and load-carrying ability for equipment protection under heavy and shock loading
  • Fortified with 3 percent molybdenum disulfide for retention of EP performance and equipment protection in severe sliding situations
  • Outstanding corrosion and water resistance for highly reliable lubrication in hostile environments

Specifications, approvals and technical details

Specifications and approvals  

Mobil Centaur™ Moly 1 grease is recommended by ExxonMobil for use in:

  • Heavy-duty trucks, especially hinge and bucket pins, U-joints and fifth wheels
  • Mining and construction equipment
  • Highly loaded plain and antifriction industrial bearings

Technical details  

NLGI Grade 1
Thickener Type Calcium Sulfonate
Color, visual Gray
Molybdenum Disulfide, wt%, Calculated 3%
Penetration, Worked @ 25°C, mm/10, ASTM D217 325
Dropping Point, °C, ASTM D2265 288
Viscosity of Oil, cSt @ 40°C, ASTM D445

cSt @ 40ºC 320
Timken OK Load, ASTM D 2509, lb 60
4-Ball Weld Test, ASTM D 2596, Weld Point, Kg 500
4-Ball Wear, ASTM D 2266, 40 kg, 1200 rpm, mm 0.50
Water Spray resistance, ASTM D 4049, mass % 25
Water Washout, ASTM D 1264 1 hr. @ 79ºC, % 1.0
View product data sheet for

Mobil Centaur™ Moly 1 grease

Specifications and approvals  

Mobil Centaur™ Moly 2 grease is recommended by ExxonMobil for use in:

  • Heavy-duty trucks, especially hinge and bucket pins, U-joints and fifth wheels
  • Mining and construction equipment
  • Highly loaded plain and antifriction industrial bearings

Technical details  

NLGI Grade 2
Thickener Type Calcium Sulfonate
Color, visual Gray
Molybdenum Disulfide, wt%, Calculated 3%
Penetration, Worked, 25ºC, ASTM D 217 265 (min)
Dropping Point, ºC, ASTM D 2265 280
Viscosity of Oil, ASTM D 445

cSt @ 40ºC 320
Timken OK Load, ASTM D 2509, lb 60
4-Ball Weld Test, ASTM D 2596, Weld Point, Kg 500
4-Ball Wear, ASTM D 2266, 40 kg, 1200 rpm, mm 0.38
Water Washout, ASTM D 1264 1 hr. @ 79ºC, % 1.0
Water Spray resistance, ASTM D 4049, mass % 20
View product data sheet for

Mobil Centaur™ Moly 2 grease

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