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Home > Lubrication and Additives > AMSOIL Synthetic Oil > Gear Lubes
AMSOIL 75W-90 Long Life Synthetic Gear Lube
Part Number: AMZ-FGR
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  • Description
  • Reviews
ong Life Synthetic Gear Lube SAE 75W-90 (FGR)
Specifically engineered for extended drain intervals up to 500,000 miles as set by equipment manufacturers for over-the-road trucks and heavy equipment. Provides long life in passenger cars and trucks. Protects against wear and improves equipment life. Excellent "All Season" summer and winter performance. Outperforms all conventional gear oils. Compatible with most limited-slip differentials.

AMSOIL Long Life Synthetic Gear Lubes are extended drain gear lubes engineered specifically to last several times longer and protect gears better than all conventional gear oils. These exclusive AMSOIL formulations of premium synthetic base oils and high performance additives resist acid, carbon and varnish formation from oxidative breakdown. Components run cleaner and last longer. AMSOIL Long Life Synthetic Gear Lubes are shear stable and friction reducing. They maintain their viscosity during extended service for maximum wear control and they are fuel-efficient. The superior cold temperature fluidity and high temperature stability properties of AMSOIL Long Life Synthetic Gear Lubes make them excellent for all-season use. Equipment lasts longer and maintenance costs are reduced with AMSOIL Long Life Synthetic Gear Lubes.

AMSOIL Long Life Synthetic Gear Lubes, in the correct viscosity grades, are recommended for all domestic and foreign applications such as over-the-road trucks, light, medium and heavyduty trucks, off-road equipment, commercial vehicles, motorhomes, autos, SUVs, emergency vehicles, buses, delivery/utility vehicles and tractors.

Use AMSOIL Long Life Synthetic Gear Lube 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) plus hypoid gear oil specifications from all foreign and domestic manufacturers such as GM, Ford and Daimler Chrysler. Can also be used in rear axles where API Service GL-4 lubricant is recommended.

AMSOIL Long Life Synthetic Gear Lubes provide:

  • High Load Gear and Bearing Protection
  • Reduced Operating Temperatures
  • Rust and Corrosion Protection
  • Better Cold Weather Shifting
  • Improved Efficiency
  • Improved Seal Life
AMSOIL Long Life Synthetic Gear Lube 75W-90 (FGR)
Kinematic Viscosity @ 100C, cSt (ASTM D-445)
Kinematic Viscosity @ 40C, cst (ASTM D-445)
Viscosity Index
Brookfield Viscosity, cP (150,000 Max)
98,300 @ -40C
Flash Point, C (F) (ASTM D-92) 150C Min.
214 (417)
Pour Point, C (F) (ASTM D-97)
Copper Corrosion (ASTM D-130) 1b Max @ 121 C (250F) / 3hr
Foam Stability (ASTM D-892) (20/50/20 maximum)

For product service life in differentials, consult your owner's manual or the Original Equipment Manufacturer (OEM) to establish the application, NORMAL or SEVERE.

Cars, SUV, Light Trucks Normal Service Drain at 100,000 miles of service or according to the owner's manual, whichever is longer
Cars, SUV, Light Trucks Severe Service 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) for synthetic oil up to 500,000 miles or five years, whichever comes first. Otherwise, drain at twice the OEM interval for petroleum oil.
Vocational/Delivery Follow the OEM drain interval (miles or hours) for synthetic oil up to 180,000 miles or three years, whichever comes first. Otherwise, drain at twice the OEM interval for petroleum oil.
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. Otherwise, drain at twice the OEM interval for petroleum oil.

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