Gear Oils

80W-90 Marine Gear Oil
Reccomended for use where a 80W-90 gear oil that meets API Service GL-5 and MT-1, SAE J2360, and/or Mack GO-J and GO-H is specified

80W-90 Marine Gear Oil

MAG 1 High Performance Marine SAE 80W-90 Lower Unit Gear Lube is formulated for the high performance requirements of all stern drives and outboard engines. It is formulated with special anti-wear additives and corrosion inhibitors to protect gears and bearing surfaces. This product has been formulated to meet API Service GL-5.

Benefits of MAG 1 High Performance Marine 80W-90 Gear Oil include:

  • Superior protection against wear, espically under extreme pressure and high torque operation
  • High resistance to thermal breakdown
  • Helps prevent foaming, rust and corrosion
  • Smoothes and quiets operation


For product numbers and detailed packaging information, please click on the pack size listed on the right hand side of the page.

Inspection Data Typical Physical Properties of
MAG 1 80W-90 Marine Gear Oil
Specific Gravity @ 60°F (15.6°C) ASTM D4052 0.8885
Viscosity @ 40°C cSt ASTM D445 130.9
Viscosity @ 100°C cSt ASTM D445 13.98
Viscosity Index ASTM D2270 104
Color ASTM D1500 7
Pour Point °C (°F) ASTM D5950 -33°C (-27°F)
Gravity, °API ASTM D287 27.76
Brookfield Viscosity at -26°C, cP ASTM D2983 92,000

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