Best Marine Lower Unit Gear Oil

Peter | 31-08-2025

You will find our hand-picked selection of Best Marine Lower Unit Gear Oil below. You have a wide variety of choices of brands such as Quicksilver,Lucas Oil,SankWin,STAR BRITE available to you as a result of the fact that each one of them has a unique pricing, look, and feel. Continue reading for an in-depth analysis in our Best Marine Lower Unit Gear Oil buying guide!

Our experts tested a variety of Best Marine Lower Unit Gear Oil on the market. Right at the top of the list is Quicksilver Best Marine Lower Unit Gear Oil. Check out some more of our favorites below, and read some valuable insight from our experienced editors.

Editor's Choice
Lucas Oil 10652 Synthetic SAW 75W-90 M8 Marine Gear Oil - 1 Quart
Lucas Oil 10652 Synthetic SAW 75W-90 M8 Marine Gear Oil - 1 Quart
Premium Pick
Quicksilver by Mercury Marine 80W-90 Premium Gear Lube, Marine Engine, 32 oz.
Quicksilver by Mercury Marine 80W-90 Premium Gear Lube, Marine Engine, 32 oz.
Budget Pick
SankWin Boat Lower Unit Gear Lube Oil Pump Compatible with Mercury Yamaha Honda Suzuki Evinrude
SankWin Boat Lower Unit Gear Lube Oil Pump Compatible with Mercury Yamaha Honda Suzuki Evinrude

Top 10 Best Marine Lower Unit Gear Oil

We researched and compared the top products in the Best Marine Lower Unit Gear Oil category to provide you with these recommendations.

1. Quicksilver 858064Q01 SAE 90 High Performance Gear Lube , 32 oz

Quicksilver 858064Q01 SAE 90 High Performance Gear Lube , 32 oz
7.7

Quicksilver

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  • Lower unit gear oil formulated to protect against corrosion and excessive wear
  • Designed for outboard motor lower unit and sterndrive applications above 75 HP
  • Extreme pressure synthetic additives protect gears from metal to metal contact
  • Extends gear life in extreme conditions including high-speed and high-horspower applications
  • SAE 90 viscosity
  • 1 quart bottle
  • Manufacturer part number 858064Q01

2. Quicksilver by Mercury Marine 80W-90 Premium Gear Lube, Marine Engine, 32 oz.

Quicksilver by Mercury Marine 80W-90 Premium Gear Lube, Marine Engine, 32 oz.
9.1

Quicksilver

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  • Direct replacement for Mercury Marine 858058K01
  • Provides maximum protection against excessive wear, corrosion and pitting for extended gear life in marine applications
  • Contains additives to protect gears if water enters the gear case or lower unit
  • Recommended for use in outboard motor gear cases and marine lower units in applications below 75hp
  • 80W-90 viscosity
  • 32 oz. bottle (pack of 6)
  • Produced to meet Mercury Marine original equipment manufacturer specifications to best protect your engine

3. Lucas Oil 10652 Synthetic SAW 75W-90 M8 Marine Gear Oil - 1 Quart

Lucas Oil 10652 Synthetic SAW 75W-90 M8 Marine Gear Oil - 1 Quart
9.5

Lucas Oil

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  • For best performance, follow the manufacturer's recommendations in your vehicle owners manual.

4. SankWin Boat Lower Unit Gear Lube Oil Pump Compatible with Mercury Yamaha Honda Suzuki Evinrude

SankWin Boat Lower Unit Gear Lube Oil Pump Compatible with Mercury Yamaha Honda Suzuki Evinrude
8.9

Sankwin

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  • The manual oil pump can transfer gear oil, transmission fluid and differential fluid on boat engines, ideal for DIYers
  • The 8cc gear oil change kit is designed for standard quart bottles with 28mm bottle opening
  • Package contains: oil pump, 50cm flexible hose, 3/8" swivel steel adapter, 8mm adapter, 10mm adapter, rigid suction tubes, clamp and drain screw gaskets 26-830749 26-8M0204693
  • With the 3/8" swivel steel adapter, this lower unit gear oil pump fits most Mercruiser OMC stern / out drives, most Johnson Evinrude Mercury Mariner Force outboards and most US-origin models
  • With the 8mm and 10mm adapter, this lower unit gear lube pump is suitable for outboard motors in other countries, such as Yamaha Honda Suzuki Tohatsu

5. STAR BRITE High Viscosity Lower Unit Gear Lube 80w 90w - 32 OZ (027032)

STAR BRITE High Viscosity Lower Unit Gear Lube 80w 90w - 32 OZ (027032)
8.3

Star Brite

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  • Recommended for use in Mercury, Mercruiser, Johnson, Evinrude, OMC, Force, Mariner, Nissan, Suzuki, Yamaha and Volvo Will not void manufacturers warranties
  • Formulated with special anti-wear additives, rust and corrosion inhibitors.
  • For lower units of all outboard motors and stern drives.

6. Lucas Oil 10046 SAE 80W-90 Heavy Duty Gear Oil - 1 Gallon

Lucas Oil 10046 SAE 80W-90 Heavy Duty Gear Oil - 1 Gallon
8.9

Lucas Oil

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  • Affordable Solutions
  • Provides rust protection
  • Ideal for shock loading applications
  • Can be used in limited slip differentials

7. LubriMatic 11552 High Viscosity Lower Unit Gear Lube - 1 Quart

  • LubriMatic 11552 High Viscosity Lower Unit Gear Lube - 1 Quart

8. Mercury Marine New OEM High Performance Gear Lube with Hand Pump, 91-8M0101435

Mercury Marine New OEM High Performance Gear Lube with Hand Pump, 91-8M0101435
8.5

Mercury

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  • Genuine OEM Factory Original Equipment Mercruiser Sterndrive & Outdrive Oil
  • Exclusive formula is engineered to provide extended gear life in extreme conditions including high-speed and high-horsepower applications
  • Extreme pressure synthetic additives protect gears from metal to metal contact
  • Engineered to provide maximum protection for sterndrive and outboard lower units
  • For use in most gear housings of Mercruiser sterndrives and all Mercury, Mariner, and Force Outboards

9. Lower Unit Gear Oil Pump for Standard Quart Bottles, 3/8 inch Metal Swivel, 8mm and 10mm Adapters,

Lower Unit Gear Oil Pump for Standard Quart Bottles, 3/8 inch Metal Swivel, 8mm and 10mm Adapters,
7.9

Bolaxin

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  • Lower Unit Gear Oil Pump fits for Standard Quart Bottles. Fits for Most Marine Boat Outboard Motors (NOT fits for VOLVO PENTA).
  • Fits for all standard 1 quart lower unit lube bottles. Perfect for most 32 ounce outboard gear oil bottles.
  • Pump 8CC per pump stroke. Easily press down. Comes with 2 Rigid Suction Tubes to ensure the pump can reach the battom of tall and short bottles.
  • 3 Adapters Sizes: 3/8" swivel adapter connected to clear plastic tubing. 8mm and 10mm metal adapter fits for most foriegn outboard motor's lower unit drain threads hole.
  • Buy according to your needs, with different adapters, this lower unit gear oil pump change and refills the marine motor lower unit gear lube in a few minutes. Easily and quickly work.
  • Packaged: 3*adapters, 2*tubes, 1*pump, 1*hose. Having any questions, please contact to us and got an ideal solution.

10. Slippery Pete - Lower Unit Gear Oil Pump for Standard Quart Bottles, Includes 3/8 inch Metal Swivel,

Slippery Pete - Lower Unit Gear Oil Pump for Standard Quart Bottles, Includes 3/8 inch Metal Swivel,
8.7

Slippery Pete

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  • PUMPS 8CC PER PUMP STROKE (Includes Metal 3/8" Adapter Connected To Clear Plastic Tubing)
  • THIS GEAR OIL CHANGE KIT includes 3 adapter sizes. 3/8"(Swivel, Metal), 8mm and 10mm (Metal). Take the guess work out of figuring out the size of your Lower Unit's gear oil drain plug. (WON'T FIT VOLVO PENTA)
  • 2 Rigid Suction Tubes REACHES TO BOTTOM OF TALL AND SHORT GEAR OIL BOTTLES
  • Easy To Follow Instructions On Back Of Header Card
  • Re-closeable Poly Bag for Storage

Peter

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