Provides Exceptional Gear Protection without EP Additive

Almasol® Pure Mineral Gear Lubricant (401) is a balanced formulation of base oil, rust and oxidation inhibitors, wear-reducing agents, and other additives that provides the highest level of protection possible without the inclusion of an extreme pressure additive. When transmission and gearbox manufacturers specify a “pure” or “straight” mineral oil gear oil, it should not contain a chemically active EP agent; other additives, however, are still acceptable for inclusion. In addition to other highly desirable additives, the Almasol 401 formulation contains Almasol, LE’s exclusive wear-reducing additive that protects against premature wear and shields metal against corrosive attack.

Unit of Measure

Benefits and Recommendations

Available Container Size

N/A Quarter Drum

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GHS Statement

N/A For commercial and professional use only

Beneficial Qualities


Longer Gear Life 

  • Reduces wear with excellent film strength, lubricity and wear-reducing additives
  • Climbs gears immediately at startup, assuring immediate lubrication
  • Stays in place, even after equipment remains idle for extended periods
  • Reduces operating temperatures over ordinary gear oils

Longer Oil Life

  • Withstands elevated temperatures without oxidizing and forming sludge
  • Resists formation of rust and corrosive acids that can result from moisture
  • Is nonfoaming in service

Lower Operating Costs 

  • Ensures longer gear and lubricant life
  • Reduces downtime
  • Reduces expenses for labor and parts
  • Does not affect seals

Available Grades

  • ISO 220 / SAE 110

Performance Requirements Met or Exceeded

  • API GL-1
  • USDA H2

Typical Applications

  • Transmissions requiring a pure mineral oil or GL-1 gear oil
  • Standard truck transmissions, including Road Ranger, that do not use EP gear oils, including some dump trucks and bulk feed trucks
  • In place of SAE 50 engine oil in transmissions, final drives, etc.
  • Power takeoff systems
  • Snow cat machines (as hub oil)
  • Gearboxes requiring a pure mineral oil or an R&O non-EP gear oil
  • Vacuum pumps

Not for use where GL-4 or GL-5 fluids are recommended
Not for use in automatic, semi-automatic or hydraulic transmissions, or in common sump systems combining gear lubricant, hydraulic oil and power steering fluid

Asset Reliability Solutions

N/A Reliability Solution Products

Physical Characteristics - Typical


N/A Purple

ISO VG / SAE Grade

N/A 220/110

AGMA Grade

N/A 5 R&O

Performance Test Results

Relative Density @ 60ºF/60ºF, ASTM D1298

N/A .0882

Viscosity @ 100°C, cSt, ASTM D445

N/A 19.98

Viscosity @ 40°C, cSt, ASTM D445

N/A 230.2

Viscosity Index ASTM D2270

N/A 100

Pour Point °C (°F), ASTM D97

N/A -18 (0)

Flash Point ºC(ºF), ASTM D92

N/A 280 (536)

Rust Test 4 hrs @ 60ºC, Sea H2O, ASTM D665B

N/A Pass

Evaporation 22 hrs @ 100ºC, % loss, ASTM D972

N/A 0.6