AMSOIL 75W-90 Long Life Gear Lube Fully Synthetic (FGR)

AMSOIL 75W-90 Long Life Gear Lube is an extended-drain, fully synthetic gear oil engineered to last several times longer and protect gears better than conventional gear oils. Its premium synthetic base oils and high-performance additives help resist oxidative breakdown so components run cleaner and last longer. It’s shear-stable, reduces friction, maintains viscosity for maximum wear control and delivers excellent all-season performance.

Key Benefits

• Provides long service life (engineered for extended drain intervals up to 500,000 miles in over-the-road trucks/heavy equipment as set by OEMs)

• Fights gear and bearing wear (shear-stable; durable protective film; resists chemical breakdown)

• Improves efficiency and convenience (better cold flow vs conventional; helps maximize fuel economy; resists acids to maintain cleanliness)

• Conditions seals and helps prevent rust for longer equipment life and reduced maintenance costs

Applications (Specifications / Approvals)

Use in differentials, manual transmissions or other gear applications where one or more of the following standards are specified:

• API GL-5 & MT-1

• MIL-PRF-2105E

• Dana SHAES 234 (formerly Eaton PS-037) for 250,000 miles

• Dana SHAES 256 (formerly Eaton PS-163) for 500,000 miles

• Dana SHAES 429A

• Mack GO-J & GO-J+

• Meritor 0-76N (75W-90) & 0-80 (80W-140)

• Hypoid gear oil specifications from ZF TE-ML 07A and 08
  It can also be used in rear axles where an API Service GL-4 lubricant is recommended.

Change / Drain Interval (Service Life)

For differentials, establish Normal vs Severe based on the owner’s manual/OEM guidance:

• Cars, SUVs & Light Trucks

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

  • Severe: Drain at 50,000 miles 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) up to 500,000 miles or five years, whichever comes first

• Vocational/Delivery

  • Follow the OEM drain interval (miles or hours) for synthetic oil up to 120,000 miles 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, follow the OEM’s normal/severe synthetic oil service intervals; if unavailable, drain at twice the interval for conventional oil.

Note: Extended drain intervals are not supported where water contamination occurs—check and service gear oil frequently when water contamination is possible.