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Gear Master Multi-Purpose

80W-90, 85W-140 gear oil

Gear-Master Multi-Purpose 80W-90/85W-140 gear oils are multi-purpose straight mineral gear lubricants. They are designed to meet the widest range of needs for both off- and on-highway vehicles including trucking, agriculture, construction, and industrial equipment. They are made from high quality base oils using a modern sulfur-phosphorous extreme pressure additive system that provides wear resistance, oxidation stability, and rust/corrosion protection. Gear-Master Multi-Purpose gear oils also provide excellent protection against shock loading of gears.

Features & benefits

  • Reduced wear: Superior extreme pressure (EP) properties reduce wear in heavily loaded gear sets where hydrodynamic lubrication may not be complete
  • Oil durability: Excellent oxidation stability reduces oil degradation from high temperatures and enables long drain intervals
  • Rust and corrosion protection: Outstanding protection against rust and corrosion assures protection of the gear box materials from contaminates
  • Foam control: Superior foam reduction aids in reducing oxidation and fluid breakdown

Excellent performance

  • API GL-5, MT-1
  • Mil-PRF-2105E, SAE J2360
  • DAN
  • Eaton
  • Arvin Meritor (Rockwell) 076-B,E,N,Q, and 0-80
  • Navistar TMS 6816
  • Mack GO-J Plus, GO-J
  • Limited Slip Differential
  • Typical specifications
    SAE viscosity grade SAE J-300 80W-90 85W-140
    API gravity lbs/gal ASTM D-287 26.4/7.46 26.4/7.46
    Viscosity @ 40°C, cSt ASTM D-445 146 381
    Viscosity @ 100°C, cSt ASTM D-445 14.5 26.1
    Viscosity index ASTM D-2270 97 92
    Pour point, °F (°C) ASTM D-97 -22 (-30) -11 (-24)
    Flash point, COC ASTM D-92 400°F 420°F
    Fire point, COC ASTM D-92 445°F 465°F
    Color ASTM D-1500 6.5 8.0
    Sulfur % ASTM D-2622 2.07 2.12
    Copper strip corrosion ASTM D-130 1B 1B

  • Recommended for

    Gear Master can be used in differentials, axles, final drives and manual transmissions calling for a GL-5/MT-1/EP gear lubricant:

    • Trucks, tractors, construction
    • On road/off road
    • Hypoid and bevel gear differentials
    • Limited slip (top off only in cars/light trucks)
    • Industrial equipment
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