AMSOIL Long Life Synthetic 80W-140 Gear LubeAMSOIL Long Life 80W-140 Synthetic Gear Lube is an excellent upgrade for semi-truck, heavy-duty and automotive applications. It delivers outstanding wear protection and ultra-long service life. An ideal synthetic replacement for any application requiring an API GL-5 80W-140 or 85W-140.

Long Life 80W-140 package sizes include:
5- US Gallon Pail
16- US Gallon Keg
30- US Gallon Drum
55- US Gallon Drum

Oil Depot can offer AMSOIL Long Life 80W-140 Synthetic Gear Lube at wholesale prices in Canada or the United States. Request a synthetic gear lube price list using the contact form on your right. Truckers and transport companies can qualify for commercial wholesale accounts.

Features and Benefits of AMSOIL Long Life 80W-140 Synthetic Gear Lube

  • Designed for 500,000 mile (800,000 km) service in semi-trucks
  • Lowers friction to maximize efficiency
  • Brings steady wear defense
  • Thrives in extreme hot or cold operation
  • Keeps seals conditioned

Dependable Wear Protection

Differential oil changes don’t happen often, so when you do perform this service, do it right. AMSOIL unites a sophisticated shear-proof synthetic base oil and with robust extreme pressure additives. The result is dependable service, mile after mile (half million of them, actually). Long Life 80W-140 Synthetic Gear Lube withstands heavy loads and stabilizes operating temperatures when the going gets tough.

Amazing Cold Weather Performance

One wouldn’t expect an 80W-140 gear oil to perform well in sub-zero temperatures. AMSOIL Long Life 80W-140 Synthetic Gear Lube is an exception to this thinking with a remarkable cold-pour-point of -40°C (-40°F). This product not only flows and protects in frigid climes, it offers consistent efficiency all winter long.

Applications for AMSOIL Long Life 80W-140 Synthetic Gear Lube

This product is ideal for differentials, manual transmissions, transfer cases and gear boxes suggesting the following industry specifications where an 80W-140 or 85W-140 gear lube is suggested:

  • API GL-5
  • API MT-1
  • MIL-PRF-2105E
  • Dana SHAES 234 (for 250,000 mile or 400,000 km)
  • Dana SHAES 256 (for 500,000 miles or 800,000 km)
  • Eaton PS-037, PS-163
  • Mack GO-J & GO-J+
  • Meritor 0-76N
  • Navistar TMS 6

Service Life of AMSOIL Long Life 80W-140 Synthetic Gear Lube

Heavy Duty Class 8 Trucks, Delivery Trucks, Buses

Change at intervals up to 500,000 miles (800,000 km) or follow the OEM recommendation for synthetic oil (whichever comes first).

Automotive Applications

Note: These service intervals do not apply in situations where water immersion occurs. Gear lube must be changed frequently under these conditions.

Normal Service

Change at 100,000 miles (160,000 km) or the interval as prescribed by the OEM (whichever is longer).

Severe Service*

Change at 50,000 miles (80,000 km). *Severe service can be described as racing, frequent towing, snow-plowing, hauling or frequently dusty conditions.

Heavy Duty Off-Road

Follow the OEM recommendation for synthetic oil (whichever comes first). If these recommendations do not apply, change at twice the OEM oil change interval for conventional oil.

Limited Slip Differentials and AMSOIL Long Life 80W-140 Synthetic Gear Lube: Is a Friction Modifier Additive Needed?

AMSOIL Long Life 80W-140 Synthetic Gear Lube does contain limited-slip additives, but differential chatter can occasionally occur in some vehicles. As a precautionary measure, we recommend adding roughly two-thirds of the recommended dose of AMSOIL Slip-Lock Limited Slip additive or the counterpart OEM limited-slip differential additive.

Read more in our article: Does Friction Modifier Need to Be Added to AMSOIL Gear Lube in Limited-Slip Differentials

Mixing AMSOIL Long Life 80W-140 Synthetic Gear Lube with Other Brands

AMSOIL Long Life 80W-140 Synthetic Gear Lube is compatible with all other brands of conventional, semi-synthetic and synthetic gear oils. While you can safely mix AMSOIL 80W-140 Gear Lube with other brands, this will reduce the drain interval and performance capabilities of AMSOIL gear oil.

The use of any aftermarket oil additives (other than limited-slip friction modifiers) is definitely NOT recommended.


AMSOIL Long Life Synthetic Gear Lube 80W-140 (FGO)

Kinematic Viscosity @ 100°C, cSt (ASTM D-445)
Kinematic Viscosity @ 40°C, cst (ASTM D-445)
Viscosity Index (ASTM D-2270)
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
Falex Procedure B (ASTM D-3233) (failure load, lbf.)
Foam Stability (ASTM D-892) (20/50/20 maximum)
A synthetic 80W-140 gear oil for transport trucks that provides long service life, exceptional wear protection and all-weather performance.
Manufacturer: AMSOIL
Model: Long Life 80W-140 Synthetic Gear Lube
Product ID: FGO