Offers Dependable, Heavy-Duty Performance in Diesel Engines

Monolec® Engine Oil provides excellent service for engines in mobile equipment and stationary generators. With its formulation of select base oils, shear-stable viscosity improver and Monolec®, LE’s exclusive wear-reducing additive, Monolec Engine Oil offers increased fuel efficiency, dependable performance and wear protection.

Unit of Measure

Benefits and Recommendations

Available Container Size

N/A Case Three 2-Gal Jugs

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Beneficial Qualities

N/A Cost-Saving Service
  • Reduces oil consumption
  • Increases fuel efficiency
  • Improves reliability and minimizes downtime

Wear Prevention & Protection
  • Includes synergistic blend of high-quality base oil and oxidation inhibitors to prevent excessive thickening and deposit formation
  • Contains combination of wear-reducing agents
    • Provides maximum wear prevention
    • Extends engine life
    • Keeps engine parts clean with heavy-duty detergents and dispersants
All-Weather Performance
  • Provides good viscosity properties in all weather
    • Ensures minimal drag during low-temp startups
    • Effectively lubricates at high temps

Emissions Reduction
  • Works in conjunction with EGR engines to manage soot and other exhaust contaminants
  • Low SAPS formula minimizes poisoning of SCR systems and particulate filtration traps

Proprietary Additives


LE’s proprietary additives are used exclusively in LE lubricants. Monolec® Engine Oil contains Monolec.

Monolec® wear-reducing additive creates a single molecular lubricating film on metal surfaces, vastly increasing oil film strength without affecting clearances. An invaluable component in LE’s engine oils, industrial oils and many of its other lubricants, Monolec allows opposing surfaces to slide by one another, greatly reducing friction, heat and wear.

Performance Requirements Met or Exceeded

  • API-SAE Service CK-4
  • ACEA E9-2012, E7
  • Caterpillar ECF-3,ECF-2
  • Cummins CES 20086, CES 20081
  • Daimler MB 228.31
  • Detroit Diesel DFS 93K222, DFS 93K218
  • Ford WSS M2C171-F1
  • Mack EOS-4.5, EO-O Premium Plus, EO-N
  • Man M3575
  • MTU Category 2.1
  • Renault RLD-4, RLD-3
  • Volvo VDS-4.5, VDS-4, VDS-3

Typical Applications

  • Diesel engines (fleet)
    • On- and off-road mobile equipment, including over-the-road tractor trailers, pickup trucks, construction equipment, farming equipment and more
    • Specially formulated for low-emission and ultra low sulfur diesel (ULSD) engines and backwards compatible for use in older diesel engines
  • Diesel engines (industrial)
    • Stationary generators


  • Compatible for use with Diesel Particulate Filters
  • Not for use with silver alloy bearings such as EMD engines (Electro-Motive Division of GM)

Physical Characteristics - Typical


N/A Amber

SAE Grade

N/A 15W-40

Performance Test Results

Relative Density @ 60ºF/60ºF, ASTM D1298

N/A 0.8713

Viscosity @ 100°C, cSt, ASTM D445

N/A 15.20

Viscosity @ 40°C, cSt, ASTM D445

N/A 114.70

Viscosity Index ASTM D2270

N/A 138

Viscosity-HTHS @ 150ºC, cP, ASTM D4683

N/A 4.02

Viscosity-CCS @ -20°C, cP, ASTM D5293

N/A 4,930

Viscosity-MRV TP-1 @ -25°C, cP, ASTM D4684

N/A 18,600

Pour Point °C (°F), ASTM D97

N/A -31 (-24)

Ash--Sulfated %, ASTM D874

N/A 1.00

Acid Number mg KOH/g, ASTM D664

N/A 3.25

Base Number ASTM D2896

N/A 9.0