High Performance lubricant engineered to meet the demands of marine applications. AMSOIL Universal Synthetic Marine Gear Lube provides:
• Excellent Gear and Bearing Protection even when contaminated with 10% water
• Reduced Friction and Wear
• Rust and Corrosion Protection
• Long Seal Life
• Superior Foam Prevention
Package sizes include:
10-oz. Tube
1-Quart Easy Pack
1-Quart Bottle
5-Gallon Pail
16-Gallon Keg
30-Gallon Drum
55-Gallon Drum
AMSOIL Universal Synthetic Marine Gear Lube is recommended for fresh and salt water applications requiring either 75W-90 or 80W-90 viscosity grade and meeting either API GL-4 or GL-5 performance standards.
Examples of AMSOIL Universal Synthetic Marine Gear Lube applications include:
Outboard Lower Units:
• Mercury/Mariner
• Johnson/Evinrude
• Bombardier
• Honda
• Yamaha
• Suzuki
• Force/US Marine
• Nissan
• Tohatsu
• Harbormaster Marine Outboard Drives
• Sears Gamefisher and Seagull
Sterndrives:
• Mercruiser-Bravo
• OMC/Bombardier
• Volvo-Penta
• Yanmar
• Konrad
• Marine Drive Systems
V-Drives:
• Casale & Menkens
Bow & Tunnel Thrusters:
• Harbormaster Marine
Marine Transmissions:
• ZF Marine Transmission
AMSOIL Universal Synthetic Marine Gear Lube is an exclusive AMSOIL formulation of synthetic base oils and high performance additives that address the specific concerns of marine applications. It is extreme pressure (EP) additive fortified for superior protection of fast accelerating, high torque/horsepower engines. It protects against shock loading from cavitation of heavily loaded engines.
AMSOIL Universal Synthetic Marine Gear Lube is water resistant. It maintains extreme pressure protection even when contaminated with as much as 10% water. It promotes longer seal life, preventing excessive water leakage. AMSOIL Universal Synthetic Marine Gear Lube protects against rust and is compatible with aluminum, copper and brass alloys.
Marine gear oils operate in environments subject to water contamination. The chart below demonstrates the ability of AMSOIL Universal Synthetic Marine Gear Lube to maintain designed qualities such as extreme pressure/anti-wear performance and resistance to foaming, even when subjected to 10% water contamination.
The Falex Procedure is measurement of a gear lube's extreme pressure and anti-wear properties. A high value in the Falex Extreme Pressure Test relates to extra extreme pressure protection. AMSOIL Universal Synthetic Marine Gear Lube is not affected by water and provides 50% more extreme pressure protection for long gear and bearing life.
The presence of foam in a lubricant disrupts oil film and promotes wear. Water contamination can increase the likelihood of foaming. Industry standard testing demonstrates zero foam in both new and water-contaminated AMSOIL Universal Synthetic Marine Gear Lube. Other conventional gear lubes can foam when mixed with water, as seen in the graph.
Extreme Pressure and Foam Stability Testing | |||||||||||||||
Test | AMSOIL Universal Synthetic Marine Gear Lube (AGM) | Conventional Gear Lube (A) | Conventional Gear Lube (B) | ||||||||||||
| FALEX Extreme Pressure Load Test B (LbF) (ASTM D-3233B) |
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Foam Stability |
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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 AGM.
Keep out of the reach of children. Don't pollute. Return used oil to collection centers.
| TYPICAL TECHNICAL PROPERTIES AMSOIL Universal Synthetic Marine Gear Lube75W/80W-90 (AGM) | |
| Kinematic Viscosity @ 100°C, cSt (ASTM D-445) | 14.7 |
| Kinematic Viscosity @ 40°C, cSt (ASTM D-445) | 116.0 |
| Viscosity Index (ASTM D-2270) | 130 |
| Flash Point °C (°F) (ASTM D-92) | 216 (420.8) |
| Pour Point °C (°F) (ASTM D-97) | -43 (-45) |
| Falex Procedure B (ASTM D-3233) (failure load, LbF.) | 1500 |
| Foam Stability (ASTM D-892) (20/50/20 maximum) | 0/0/0 |
Product Name: 75W/80W-90 Marine Gear Lube (AGM)
Current Rating: 4.89out of 5 stars
Votes & Reviews: 23 vote(s) and 28 user reviews.
Reviewed by RMC: 
I been using Amsoil Synthetic Marine Gear Lube on my 2017, 115hp Yamaha outboard. This product is awesome product. So far everytime I change my gear oil it's been clean with no water, it helps in smooth shifting. Excellent product, I would recommend this product for all outboard gear oil.
Reviewed by Bobby:
This has protected my lower unit for the last 12 years and my internal parts still look brand new.
Reviewed by Aido:
I use this in my work boat every day from ice out to ice in on Georgian Bay. Shifts smooth and always stays clean.
Reviewed by Bill:
I use this for Mercury outboard gear cases and it has never let me down.
Reviewed by Michael:
Bought an 89 Boat with a Cobra out drive. Previous owner had used amsoil and gave me a quart with the purchase. Once I drained the out drive for winter and saw the oil coming out I got more. This stuff is fantastic
Reviewed by Dan:
I use this in my 225 Yamaha and my 9.9 kicker for my Lund 2025. It s the only oils for my Yamahas.
Reviewed by D:
Great product
Reviewed by Scarab Jim:
I use this product in the Alpha One Gen. II outdrives on my twin engine Scarab. I`m pushing 400hp. through them and they continue to hold up because of this gear lube.
Reviewed by Chris:
Great product
Reviewed by Jeff:
I have never had a problem when using this product. I will continue to use it exclusively!
Reviewed by None:
I have used and oil since the seventies in cars and boat. I go app 5000 miles 0n quart. both my son's use it the best.
Reviewed by Jeff:
Good product, quick delivery, nice website, I'm a fan of Amsoil.
Reviewed by Reggie:
After using on multiple Yamaha outboard engines more than 100 hrs between gearcase changes ; the oil looks Chrystal clear very impressive the oil should extend the life of gearcase .
Reviewed by Pat:
Never had a problem with the lower unit and it is 15 years old.
Reviewed by Dave:
Used in Mercury Race outboard gearcase's protects internals, never any metal on the magnet.
Reviewed by Trotline:
I use this oil in my 5.7 hemi engine. My engine runs smoother and cooler.
Reviewed by Jim:
Has preformed very well and well continue to use
Reviewed by Jim:
Has preformed very well and well continue to use
Reviewed by CkDLND:
Works great even up north where I live in 32 degree water
Reviewed by EJ:
I have used the marine gear lube for many years its never let me down I highly recomend this product!!!
Reviewed by Joe:
I use this in a 1981 75hpJohnson outboard.
Little to no smoke. Smooth running. Cylinders stay clean and does not foul plugs like other oils. Even Evinrude synthetic. Awesome product.
Reviewed by Mikeapple01:
I've been using Amsoil since the 80's and I'm an ASE certified diesel mechanic with over 30 years of experience. I haven't found any other lubricant that comes close to Amsoil, I recently purchased a boat and drained all the fluids and replaced them with Amsoil marine lubricants. I know I will get years of worry free performance while using Amsoil.
Reviewed by ihboy75:
Good alternative to standard product
Reviewed by James:
This product is used in a 2013 Mercury 4 stroke outboard, 150hp. I change the oil every season with about 75 hours of use.
Reviewed by Larry:
I believe synthetic oils are great for any moving metal parts. No wear, No friction, saves money in years to come and makes my engines very dependable.
Reviewed by Daniel:
Better lube always I used in my Sea Ray Sundancer whit Bravo 3
Reviewed by carb:
easy to use and a great product.
Nothing but...
Wouldn't use anything else...28ft pontoon...125hp 4stroke...