AMSOIL Shipping Information
Online StoreAMSOIL Preferred Customer ProgramAMSOIL Business AccountsAMSOIL Dealership OpportunityOrder FREE AMSOIL Product CatalogContact Us
Email Price List

80W-140 Semi-Truck Gear Lube (FGO)

 80W-140 Semi-Truck Gear Lube (FGO)
Product Code: FGO • Brand: AMSOIL

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.

Package sizes include:

5-Gallon Pail
16-Gallon Keg
30-Gallon Drum
55-Gallon Drum

See Pricing or Place an Order
MSDSData Sheet

Product Details

Product Description

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 provide:

• High Load Gear and Bearing Protection
• Reduced Operating Temperatures
• Rust and Corrosion Protection
• Better Cold Weather Shifting
• Improved Efficiency
• Improved Seal Life


This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS).

Click here to view the MSDS Data Sheet for AMSOIL FGO.

Keep out of the reach of children. Don't pollute. Return used oil to collection centers.

Technical Data

AMSOIL Long Life Synthetic Gear Lube 80W-140 (FGO)
Kinematic Viscosity @ 100°C, cSt (ASTM D-445) 26.4
Kinematic Viscosity @ 40°C, cst (ASTM D-445) 257.6
Viscosity Index (ASTM D-2270)133
Brookfield Viscosity, cP (150,000 Max)59,926 @ -26°C
Flash Point, °C (°F) (ASTM D-92) 150°C Min.218 (424)
Pour Point, °C (°F) (ASTM D-97)-40 (-40)
Copper Corrosion (ASTM D-130) 1b Max @ 121 °C (250°F) / 3hr 1b
Falex Procedure B (ASTM D-3233) (failure load, lbf.)1500
Foam Stability (ASTM D-892) (20/50/20 maximum)0/0/0
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 TrucksDrain at 100,000 miles of service or according to the owner's manual, whichever is longerDrain 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 three years, whichever comes first. Otherwise, drain at twice the OEM interval for petroleum oil.
Heavy Duty
Off-Road Vocational
Follow the OEM drain interval (miles or hours) for synthetic oil up to 120,000 miles or one year, whichever comes first. Otherwise, drain at twice the OEM interval for petroleum oil.
For product service life in non-differential applications, consult owner's manual or the OEM for either normal or severe synthetic oil service intervals. Where service intervals are unavailable, drain at twice the interval for conventional oil.Note: AMSOIL does not support extended drain intervals where water contamination occurs. Check and service the gear oil frequently when water contamination is possible.Gear oils should be changed more frequently when operating vehicles or equipment in dusty or dirty conditions unless the gear system is properly sealed and equipped with membrane type breathers.AMSOIL LONG LIFE SYNTHETIC GEAR LUBES are compatible with conventional gear oils, however mixing oils reduces the benefits and nullifies the extended service life recommendations.AMSOIL LONG LIFE SYNTHETIC GEAR LUBES are compatible with most limited slip differentials. If limited slip differential chatter occurs, add AMSOIL Slip-Lock™ friction modifier additive.AMSOIL LONG LIFE SYNTHETIC GEAR LUBE 80W-140 replaces competitors' 80W-140 and 85W-140 viscosity grades

Related Videos

AMSOIL Tech Tips Differential & Transfercase

Differential & Transfercase can get destroyed if neglected. This tip can help avoid expensive repairs.

 80W-140 Semi-Truck Gear Lube (FGO)

Did this product meet your expectations?

(click on a star to vote)

Product Name: 80W-140 Semi-Truck Gear Lube (FGO)
Current Rating: 5out of 5 stars
Votes & Reviews: 1 vote(s) and 1 user reviews.

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Stan the Man: space

I would buy again

I put this in the rear ends on my Kenworth, so far so good!

Item Reviewed: 80W-140 Semi-Truck Gear Lube (FGO)
Discussion Url

Share your AMSOIL Experience
by writing a review

smaller | bigger


Price List Request

Receive wholesale price list in your email.