PRODUCT DESCRIPTION
AMSOIL 80W-90 Synthetic Gear Lube is a multi-functional product designed to surpass the requirements of equipment and automotive applications calling for an SAE 80W-90 viscosity grade. Formulated with wax-free synthetic base oils and high quality additives, AMSOIL 80W-90 Synthetic Gear Lube resists thermal breakdown. Its naturally high viscosity index and shear stable construction improves film strength and viscosity retention. AMSOIL Synthetic 80W-90 Gear Lube prevents wear, resists heat, and protects gears. It lasts longer in service than conventional gear oils and increases equipment life.

AMSOIL Synthetic 80W-90 Gear Lube provides:

• High Load Gear and Bearing Protection
• Longer Oil and Equipment Life
• Lower Maintenance Costs
• Compatibility With Conventional and Synthetic Gear Lubes
• Multi-functional for Multiple Applications
   

APPLICATIONS
AMSOIL Synthetic 80W-90 Synthetic Gear Lube is recommended for use under various combinations of high-speed, shock loads, low speeds and high torque conditions. It is recommended for use in all light and heavy-duty, automotive, commercial or industrial applications requiring SAE 80W-90 EP gear lube. AMSOIL Synthetic 80W-90 Gear Lube replaces all conventional 80W-90 gear oils and exceeds the lubrication and performance requirements of front and rear differentials, transfer cases, transaxles, manual transmissions, oil lubricated wheel bearings, and steering gear boxes that require any of the following specifications:

• API GL-5 & MT-1

• MIL-PRF-2105E

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

• MACK GO-J

• Arvin/Meritor 0-76D plus hypoid gear oil specifications from all foreign or domestic manufacturers such as GM, Ford and Daimler Chrysler.
• Can also be used rear axles where API Service GL-4 lubricant is recommended.

TYPICAL TECHNICAL PROPERTIES AMSOIL Synthetic Gear Lube SAE 80W-90	SAE 80W-90
Kinematic Viscosity @ 100°C, cSt (ASTM D-445)	14.9
Kinematic Viscosity @ 40°C, cSt (ASTM D-445)	116.0
Viscosity Index (ASTM D-2270)	132
Brookfield Viscosity, cP (150,000 Max) @-26°C	38,250
Flash Point °C (°F) (ASTM D 92)	218 (424.4)
Pour Point °C (°F) (ASTM D 97)	-42 (-43.6)
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.

	NORMAL	SEVERE
Cars, SUV, Light & Medium Duty Trucks	Drain at 100,000 miles of service or according to the owner’s manual, whichever is longer	Drain at 50,000 miles of service or according to the owner’s manual, whichever is longer
Heavy Duty Class 8 Truck, Commercial Equipment	Follow the OEM drain interval (miles or hours) for synthetic oil up to 250,000 miles. Otherwise, drain at twice the OEM interval for conventional oil.	Follow the OEM drain interval (miles or hours) for synthetic oil. Otherwise, drain at twice the OEM interval for conventional 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 SYNTHETIC 80W-90 GEAR LUBE is compatible with synthetic and conventional gear oils, however mixing oils reduces the benefits and nullifies the extended service life recommendations.

AMSOIL 80W-90 SYNTHETIC GEAR LUBE is compatible with most limited slip differentials. If limited slip differential chatter occurs, add AMSOIL Slip-Lock™ friction modifier additive.

Click above graph for printable PDF version AMSOIL has optimized gear lube performance for specific operating conditions. However, AMSOIL gear lubes are multi-functional and may be used in many different applications. This chart conveys the best AMSOIL recommendation based on product design and operating environment. First row product recommendations offer superior performance in the respective applications. Second row product recommendations offer excellent performance in the respective applications. The third row is exclusive to SAE 80W-90 viscosity. AMSOIL Severe Gear™ 75W-90 (SVG) and 75W-140 (SVO) synthetic gear lubes have a performance emphasis on the extreme pressure and high heat of today’s vehicle differentials. AMSOIL Long Life 75W-90 (FGR) and 80W-140 (FGO) synthetic gear lubes have a performance emphasis on 500,000 mile extended drain intervals associated with larger sumps and lower operating temperatures of over-the-road truck differentials. AMSOIL 75W-90 synthetic gear lubes will outperform conventional 80W-90 gear oils in all applications and may be used as a replacement.AMSOIL offers 80W-90 (AGL) synthetic gear lube for those customers requiring this specific viscosity grade. * Abbreviated Version

See Pricing Information or Place an Order

Package sizes include:

1-Gallon Bottle
1-Gallon Bottles (case of 4)
5-Gallon Pails
55-Gallon Drums

PRODUCT DESCRIPTION
AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) is an extreme pressure lubricant engineered specifically to meet the high temperature/high load demands of today's geared equipment. AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4), unlike conventional lubricants, doesn't break down in extreme heat and form damaging deposits, varnish and sludge. AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) maintains its protective capability even in thermally stressed conditions, preventing the ridging, rippling and spalling caused by surface distress. In addition, the superior lubricity of AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) improves fuel economy and provides limited slip capability.

Resists Oxidation and Thermal Breakdown
AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) resists the damaging effects of heat and oxidation at temperatures much higher than conventional gear lubes can resist. AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) inhibits the formation of acids and will not thicken or develop sludge, even under severe operating temperatures such as those encountered in heavy hauling and fleet operation.

Reduces Friction
AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) has an extremely low coefficient of friction due to its synthetic construction. With reduced friction, excessive operating temperatures in transmissions and differentials are reduced by 20°F to 50°F. By controlling friction, AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) reduces component wear, resists thermal degradation and improves fuel economy up to five percent.

Provides Low Temperature Protection
AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) remains fluid at extremely low temperatures to provide instant lubrication to components during start-up. In low temperatures, conventional gear lubricants thicken to make shifting difficult. At temperatures of 0°F (-18°C), it can take as long as 18 minutes for gear lube to flow and lubricate the front pinion bearing of a differential. AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) only takes 45 seconds to 2 minutes. AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) resists low temperature thickening to provide superior component protection, smoother shifting and increased fuel economy.

Protects Against Rust and Corrosion
Moisture penetration can cause the rusting of gears and bearings. AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) coats components with a durable, protective film to prevent the formation of harmful rust or corrosion.

High Load Carrying Capacity
AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) has excellent load carrying capability to protect gear surfaces in high load and speed conditions. It maintains its viscosity when exposed to the extreme shearing forces of hypoid differentials. AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) provides an extra margin of protection that effectively increases gear life.

Provides Seal Compatibility
AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) increases seal life and reduces oil leakage due to pressure build-up. It is compatible with the elastomer materials used to make seals and will not cause excessive swelling, shrinkage or hardening.

Protects Against Surface Distress
AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) is thermally durable to protect gears against surface distress in extreme pressure conditions. It provides a tough lubricating film that resists the wear, pitting and spalling caused by surface distress. With its superior film protection, AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) maintains its extreme pressure additives to increase component life.

Inhibits Foaming
AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) contains special anti-foam additives to inhibit the formation of air bubbles in the gear box. When foaming is controlled, lubricant circulation and load-carrying ability are improved.

SERVICE LIFE
With its chemically advanced formulation, AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) lasts longer than conventional petroleum gear lubes. In non-commercial passenger vehicles under normal conditions, AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) does not have to be drained. In situations where severe water and/or dirt contamination occurs, a chemical lube analysis can determine if the gear lube is still serviceable. Also, AMSOIL SAE 80W-90 Synthetic Gear Lube (GL-4) can be recycled along with used motor oil because it contain no chlorine.

APPLICATION
AMSOIL 80W-90 GL-4 Gear Lube (GL-4) is recommended for marine outboard and stern drive lower unit gears and bearings. It is also recommended where the manufacturer specifies GL-4 performance. AMSOIL 80W-90 GL-4 Gear Lube (GL-4) is not recommended as a replacement for API GL-5 products.