☰
Shop by Vehicle
Find AMSOIL Near You
Roll over image to zoom in

AMSOIL 75W-90 100% Synthetic Marine Gear Lube

Product code : AGMQT-EA

4.8 star rating
Read 80 reviews
Read 80 reviews

  • Excellent gear and bearing protection, even when contaminated with 15% water1
  • Reduced friction and wear
  • Protection against rust and corrosion
  • Long seal life
  • Superior foam prevention

    1Based upon AMSOIL testing of AMSOIL 75W-90 Synthetic Marine Gear Lube in ASTM 3233 and ASTM D892.

Product Overview

AMSOIL 75W-90 100% Synthetic Marine Gear Lube



Delivers exceptional wear protection, even when contaminated with up to 15 percent water.1 Extreme-pressure formulation controls damage from shock-loading caused by propeller cavitation. Excellent for fast-accelerating, high-horsepower boats. Protects against rust and corrosion. Keeps seals soft to minimize water leakage. Compatible with other synthetic and conventional oils. Use in fresh- and saltwater applications that require 75W-90 or 80W-90 gear lube and any of the specifications listed below, including lower units made by Mercury/ Mariner,* Johnson/Evinrude,* Bombardier,* Honda,* Yamaha,* Suzuki,* Force/US Marine,* Nissan,* Tohatsu* and Harbormaster;* sterndrives made by Mercruiser-Bravo,* OMC/Bombardier, Volvo-Penta,* Yanmar,* Konrad* and Marine Drive Systems;* V-drives made by Casale & Menkins;* bow thrusters made by Harbormaster Marine;* and transmissions made by ZF Marine Transmission.*

  • API GL-4, GL-5

See the product data sheet for full details.

PROTECTS AGAINST WEAR

  • Fortified with extreme-pressure (EP) additives for superior protection of fast-accelerating, high-torque/horsepower engines.
  • Protects against shock loading from cavitation of heavily loaded engines.
  • Delivers advanced outboard protection against power loss and gear wear, even with up to 15 percent water contamination.1

RESISTS RUST & FOAM

  • Designed to prevent rust and is compatible with aluminum, copper and brass alloys.
  • Resists foam despite water contamination to ensure a strong fluid film and excellent wear protection.
  • Promotes long seal life to help prevent water intrusion.

EASY-PACK EASES MAINTENANCE

  • Award-winning AMSOIL easy-pack reduces mess and hassle when changing lower-unit gear oil.
  • Eliminates the need to buy and store a messy gear-lube pump.

See the product data sheet for full details.

1 Based upon AMSOIL testing of AMSOIL 75W-90 Synthetic Marine Gear Lube in ASTM 3233 and ASTM D892.

*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.

Technical Specification

AMSOIL 75W-90 100% Synthetic Marine Gear Lube

Data Bulletin

Warranty

SDS



Product Reviews

AMSOIL 75W-90 100% Synthetic Marine Gear Lube

4.8 star rating
Based on 80 reviews
Based on 80 reviews
See all customer reviews
  • 5 star rating
    Great product
    By  JASON,  a  Verified Buyer  on  April 28, 2024
    Great product
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Easy to use
    By  GREG,  a  Verified Buyer  on  April 20, 2024
    Like the squeeze pouch.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Lower unit
    By  ROBERT,  a  Verified Buyer  from  Va  on  April 17, 2024
    Easy to install with the soft bottle
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great stuff
    By  STEPHEN,  a  Verified Buyer  on  March 01, 2024
    This is the best gear oil. I have it in my boat motor.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 4 star rating
    Good product
    By  TYLER,  a  Verified Buyer  from  ohio  on  January 06, 2024
    i do like the amsoil lower unit fluid. It’s seemed to work well. when i drain out the old fluid at the end of the season, it still looks new. The easy packs could be resigned somehow. it’s hard to get the last little bit out of the bags.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Excellent Volvo Penta oil
    By  Trouper,  a  Verified Buyer  from  Syracuse, NY  on  November 18, 2023
    This last summer was the first year with 100% Amsoil in the lower unit, I had been putting the last .2 qt in from a bottle of Lucas that met the required spec. This was also the first year I had zero shifting issues and it ran flawlessly all while sitting in wet slip for 6 months
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Gear lube
    By  GEORGE,  a  Verified Buyer  on  October 24, 2023
    Have used this product in the lower units since new. 19 years. Never had a failure. Great product.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Mercury and Yamaha
    By  DANIEL,  a  Verified Buyer  from  Michigan   on  October 20, 2023
    Put this in my buddies Mercury 115 the last three years and it’s cleaning up what ever was in it when he bought it used. My Yamahas only see Amsoil gear oil and it looks good each year for the change before winter sets in
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Quality marine gear lube
    By  RJW12,  a  Verified Buyer  from  Colorado  on  October 05, 2023
    Good quality marine lube in an easy fill container.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 4 star rating
    Marine
    By  DEAN,  a  Verified Buyer  on  September 22, 2023
    Worked great
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?