AMSOIL Severe Gear 80W-90 Fully Synthetic Gear Lube (AGL)

AMSOIL Severe Gear 80W-90 is a premium fully synthetic extreme-pressure (EP) gear lube engineered for maximum performance in severe-duty applications. It maintains viscosity for long-lasting protection against metal-to-metal contact, helps control friction and “thermal runaway,” protects against rust/corrosion and helps extend oil, seal and equipment life.

Key Benefits

• Advanced protection against wear

• Controls thermal runaway

• Protects against rust and corrosion

• Helps reduce operating temperatures

• Long oil, seal and equipment life

• Contains friction modifiers for limited-slip applications

Applications (Specifications / Approvals)

Use in differentials, manual transmissions and other gear applications requiring any of the following specifications:

• API GL-5

• MT-1

• MIL-PRF-2105E

• Dana SHAES 234 (Formerly Eaton PS-037)

• Mack GO-J

• Other GL-5 based specifications from vehicle manufacturers, including Ford, GM and Chrysler

• Can also be used in axles where an API GL-4 lubricant is recommended

Change / Drain Interval (Service Life)

For differentials, consult your owner’s manual or the OEM to establish whether the application is Normal or Severe:

• Cars, SUVs, Light Trucks

  • Normal Service: Drain at 100,000 miles (161,000 km) of service or according to the owner’s manual, whichever is longer

  • Severe Service: Drain at 50,000 miles (80,500 km) of service or according to the owner’s manual, whichever is longer

• Heavy-Duty Class 8 Line Haul

  • Follow the OEM drain interval (miles or hours) for synthetic oil up to 250,000 miles (402,500 km) or three years, whichever comes first

• Vocational/Delivery

  • Follow the OEM drain interval (miles or hours) for synthetic oil up to 120,000 miles (193,200 km) or three years, whichever comes first

• Heavy-Duty Off-Road

  • Follow the OEM drain interval (miles or hours) for synthetic oil up to 100,000 miles or two years, whichever comes first

For non-differential applications, consult the owner’s manual/OEM for normal or severe synthetic oil service intervals. Where service intervals are unavailable, drain at twice the interval for conventional oil.

Note: Gear oils should be changed more frequently in dusty/dirty conditions (unless properly sealed and equipped with membrane-type breathers). AMSOIL does not support extended drain intervals where water contamination occurs—check and service gear oil frequently when water contamination is possible.