Mobiltac™ 375 NC gear oils

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Enhanced Wear Protection

Product information

Technical resources

Features and Benefits

The Mobiltac NC Series of products are the most recent technology advance for the Mobiltac brand of products that have been used with great success in open gear and other mining applications for several decades. These new technology products provide significantly improved environmental and performance benefits over older diluent-type technologies. They offer the following features and potential benefits:
Features Advantages and Potential Benefits
Excellent protection of gear teeth and other machine elements under boundary lubrication conditions Less equipment wear and breakdown; lower replacement, downtime and maintenance costs
Excellent low-temperature pumpability Easy start-up at low ambient and avoids cost of preheating
Excellent resistance to water washing Maintains superb protection in wet environments; less unanticipated downtime
Minimal throw-off and dripping Less product waste and new product cost
No chipping or flaking at low temperatures Maintains protective lubricating film at low temperatures
Easy to clean up with rags and conventional solvents or cleaning fluids Improved safety and reduced maintenance costs


Mobiltac 375 NC, 325 NC and Mobiltac 275NC are designed for use in a wide variety of open gear and mining applications:

  • Mobiltac 375 NC, containing a high-viscosity base oil, is recommended for the lubrication of highly loaded open gears, including those that operate at high temperature, for example, ring gears on cement kilns and large gears on ore-processing mills
  • Mobiltac 325 NC is recommended for the same applications as Mobiltac 375 NC. It contains more diluent and has a lower viscosity for ease of application at cooler temperatures
  • Mobiltac 275 NC is designed for service as a lubricant for mine and quarry shovels, draglines, and related equipment; also open gears, racks and pinions, swing gears, booms and sticks
  • Minimum operating temperature for Mobiltac 325 NC is -18 C, 375 NC is -1 C and 275 NC is -9 C

Typical Properties

Mobiltac NC Mobiltac375 NC Mobiltac325 NC Mobiltac275 NC
Appearance Viscous, semi-fluid, black Viscous, semi-fluid, black Viscous, semi-fluid, black
Viscosity, ASTM D 445

cSt @ 40º C, with diluent 5000 1500 -
cSt @ 100º C, without diluent 1260 1000 -
Flash Point, ºC, ASTM D 92 135 110 150
Specific Gravity, ºC kg/l, ASTM D 1298 0.96 0.95 0.99
Maximum Temperature Use, ºC 121 93 -
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