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20 Best Lower Unit Oil For Mercury Outboard (2022 Updated)

Lower unit oil is a special type of oil that is used to lubricate the lower unit of a Mercury outboard motor. This oil helps to keep the gears and bearings in the lower unit working properly and helps to protect them from wear and tear.

20 Best Lower Unit Oil For Mercury Outboard

1. Mercury Optimax DFI 2 Cycle Outboard Oil

Mercury Optimax DFI 2 Cycle Outboard Oil

  • Provides the maximum protection for OptiMax and DFI engines even under the most extreme operating conditions.
  • Outperforms other oils by combining a carefully modified base stock blend with a synthetic additive package.
  • Minimises carbon build-up to help maintain engine top end speed and acceleration.
  • Superior lubrication for increased resistance to piston scuffing.
  • Will mix with typical 2-cycle engine oils.

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Leaders RPM
Frank’s Great Outdoors

Product Details

Specifications

Details
Automotive Part Type 5th Wheel Hitch/Accessory
General Part Type 5th Wheel Hitch/Accessory
Pack Size 1
Product Width (in.) 7.75 in

Reviews From Real Customers

Dewey
mudmarine08
Rgarris

2. Mercury 2-4-C Marine Lubricant with Teflon

Mercury 2-4-C Marine Lubricant with Teflon

  • For use in turbocharged direct injection (TDI) engines
  • Optimizes engine performance in marine applications

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PartsVu

Product Details

Specifications

Details
Product Dimensions 7 x 8 x 8 inches
Is Discontinued By Manufacturer No

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gsd1111
leep*2007
edgar3268

3. Quicksilver High Performance Gear Lube – 32 oz bottle

Quicksilver High Performance Gear Lube - 32 oz bottle

  • Formulated to protect against corrosion and excessive wear
  • Designed for outboard and sterndrive applications above 75 HP
  • Extreme pressure synthetic additives protect gears from metal to metal contact
  • SAE 90 viscosity

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West Marine

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Details
Size 32 oz

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Fish hoor
Steve J.
Jim C.

4. Quicksilver 2-Stroke Marine Lubricant Performance DFI Oil – 1 gal jug

Quicksilver 2-Stroke Marine Lubricant Performance DFI Oil - 1 gal jug

  • Provides the maximum protection for OptiMax and DFI engines even under the most extreme operating conditions.
  • Outperforms other oils by combining a carefully modified base stock blend with a synthetic additive package.
  • Minimizes carbon build-up to help maintain engine top end speed and acceleration.

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Bass Pro Shops

Product Details

Specifications

Details
Base Oil – Engine and Motor Oils Conventional
Container Type – Engine and Motor Oils Bottle
SAE Grade – Engine and Motor Oils Not Specified
Flash Point 162 Degrees F
Application Marine
Specific Gravity 0.8633 at 15.6 Degrees C
Base Petroleum
Container Type Bottle
For Use With 2-Cycle Engines
Viscosity @ 40C 69.7
Viscosity @ 100C 6.5
SAE Grade Not Specified
Base Oil Conventional
Country of Origin (subject to change) United States

Reviews From Real Customers

PAUL H.
CT Tom
John J.

5. Quicksilver Marine Lubricants Outboard Oil, Premium, 2-Cycle – 1 gl (3.78 lt)

Quicksilver Marine Lubricants Outboard Oil, Premium, 2-Cycle - 1 gl (3.78 lt)

  • Exclusive Quicksilver formulation provides superior lubrication for 2-cycle outboards, PWC’s, motorcycles, snowmobiles, and small engines.
  • Recommended for us in premix applications for lower horsepower, carbureted engines.
  • Maintain peak engine performance and reliability by minimizing performance-robbing carbon deposits.
  • Prevents corrosion in combustion chamber, intake and exhaust passages.
  • An all-weather formula for use down to -13 degrees Fahrenheit (-25C).

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Rural King

Product Details

Specifications

Details
Units in Package 1
Unit Size 1 gl
Directions Fuel Mixing Chart: Ratio Gas:Oil: 16:1, Ounces of Oil to Add For 1 Gal: 8, 3 Gal: 24, 6 Gal: 48, 10 Gal: 80. Ratio Gas:Oil: 25:1, Ounces of Oil to Add For 1 Gal: 5, 3 Gal: 15, 6 Gal: 31, 10 Gal: 52. Ratio Gas:Oil: 50:1, Ounces of Oil to Add For 1 Gal: 3, 3 Gal: 8, 6 Gal: 16, 10 Gal: 26. Ratio Gas:Oil: 100:1, Ounces of Oil to Add For 1 Gal: 1.5, 3 Gal: 4, 6 Gal: 8, 10 Gal: 13.
Warnings Harmful or fatal if swallowed. Combustible. This product is known to the State of California to contain chemicals that may be carcinogenic. Contains lubricating oil and petroleum distillates. Avoid frequent or prolonged contact with skin. Use only in a well-ventilated area. Do not use near heat, sparks, flame or source of ignition. If swallowed to not induce vomiting. Call physician or poison control center immediately. Keep out of reach of children.

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Wayne M.
Kosta

6. Mercury Marine High Performance Gear Lube Oil – 32 fl oz bottle

Mercury Marine High Performance Gear Lube Oil - 32 fl oz bottle

  • Engineered to provide maximum protection for sterndrive and outboard lower units.
  • Exclusive formula is engineered to provide extended gear life in extreme conditions including high-speed and high-horsepower applications.
  • Extensively tested to provide excellent protection against corrosion and excessive wear.
  • Specifically formulated to help prevent failures due to water entering the gear housing.
  • Extreme pressure synthetic additives protect gears from metal to metal contact.

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Boats.net
PartsVu

Product Details

Specifications

Details
California Prop 65 Click here for information
Ship Method Item Ships Ground Only

Reviews From Real Customers

mikeb642
fizzedlg
bshanafelt989

7. West Marine PowerPro 80W-90 Lower Unit Gear Lube, Quart

West Marine PowerPro 80W-90 Lower Unit Gear Lube, Quart

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West Marine

Product Details

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westmarine.com
BAD ANDY

8. Mercury Marine Quicksilver High Performance Gear Lube – 8 fl oz tube

Mercury Marine Quicksilver High Performance Gear Lube  - 8 fl oz tube

  • 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-horsepower applications
  • 8 ounce tube

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West Marine
Leaders RPM

Product Details

Specifications

Details
Liquid Volume 8 Fluid Ounces
Recommended Uses For Product Lube
Item Form Oil
Item Package Dimensions L x W x H 8.62 x 5.28 x 1.97 inches
Item Dimensions LxWxH 12.62 x 6.5 x 9.25 inches

Reviews From Real Customers

Coyotewayne
Pbten4
western

9. Mercury 92-858064K01 Marine SAE 90 High Performance Gear Lube 1 Quart

Mercury 92-858064K01 Marine SAE 90 High Performance Gear Lube 1 Quart

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Specifications

Details
Dimensions 6 × 12 × 12 in
Quart 1 QT

Reviews From Real Customers

Dusty
drhunter950

10. Mercury 2-4-C Marine Lubricant With Teflon Lube – 10 packs, 3 count each

Mercury 2-4-C Marine Lubricant With Teflon Lube - 10 packs, 3 count each

  • 3 oz. Cartridge (3 Pack)

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Great Lakes Skipper

Product Details

Specifications

Details
Capacity 3 oz
Unit Lenght 10.75″
Unit Width 9.5″
Unit Height 9.25″
Metric Unit Length 27.303 cm

Reviews From Real Customers

josm6089
paul k.

11. Quicksilver 58Q01 Premium Gear Lube – 32 fl oz bottle

Quicksilver 58Q01 Premium Gear Lube - 32 fl oz bottle

  • Provides excellent lubrication and wear resistance for outboard lower unit gears
  • Great for both high and low horsepower engines under varying operating conditions
  • Special additives protect gears from metal to metal contact
  • Exclusive formulation helps improve film adhesion to gears

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West Marine

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Details
Size 1-Quart

Reviews From Real Customers

Shane F.
Kamm
123sean

12. West Marine High-Viscosity 80W-90 Lower Unit Gear Lube, Quart

West Marine High-Viscosity 80W-90 Lower Unit Gear Lube, Quart

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West Marine

Product Details

13. Quicksilver Gear Lube Pump

Quicksilver Gear Lube Pump

  • 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-horsepower applications
  • SAE 90 viscosity

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DICK’S Sporting Goods
Bass Pro Shops

Product Details

Specifications

Details
Package Information Bottle
Liquid Volume 32 Fluid Ounces
Recommended Uses For Product Lubricant
Item Package Dimensions L x W x H 9.4 x 7.6 x 2.9 inches
Item Dimensions LxWxH 17 x 9 x 13 inches

Reviews From Real Customers

Panos K.
crag c.
Len S.

14. Mercury Marine Performance Dfi Oil – 2.5 gal jug

Mercury Marine Performance Dfi Oil - 2.5 gal jug

  • For Direct Injection (DI) outboard engines
  • Provides outstanding wear and corrosion protection to help extend engine life
  • Minimizes performance-robbing carbon deposits in combustion chamber
  • Reduces exhaust smoke
  • Provides increased lubricity and resistance to scuffing

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West Marine

Product Details

Specifications

Details
Assembled Product Weight 10 lbs

Reviews From Real Customers

Captain Mike
Meticulous maintainer
Klingbob

15. Mercury Oil Change and Filter Kit 75-90-115hp Four Stroke Outboard 8M0081917

Mercury Oil Change and Filter Kit 75-90-115hp Four Stroke Outboard 8M0081917

  • 75/90/115 Hp

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Leaders RPM

Product Details

Specifications

Details
Product Dimensions 13 x 10 x 11 inches
Viscosity 25w-40

Reviews From Real Customers

JOSE A.
bruce

16. Citgo MYS qt HiPerf Gear Lube

Citgo MYS qt HiPerf Gear Lube

  • High performance
  • Protection against wear, rust, corrosion and deposits
  • Superior EP lubrication
  • Improved gear protection

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Blain’s Farm & Fleet
SHC Supply

Product Details

Specifications

Details
Oil Viscosity 80W-90
Oil Type Marine Gear Oil
Package Size 1 Quart
Oil Composition Synthetic Blend

Reviews From Real Customers

Sandyg11

17. Star Brite 027010 10 oz. Tube Lower Unit Gear Lube 80W 90

Star Brite 027010 10 oz. Tube Lower Unit Gear Lube 80W 90

  • 10 oz

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Marine Parts Source
Zoro
Brand New Tools

Product Details

Specifications

Details
Ships free when order qualifies Yes
Hazmat Fee No

Reviews From Real Customers

B.M.G.
H.A.
g.c.

18. Sierra Synthetic Lower Unit Gear lubricant – 32 oz jug

Sierra Synthetic Lower Unit Gear lubricant - 32 oz jug

  • Specifically formulated to optimize gear life.
  • Provides superior wear protection in severe operating conditions.
  • Recommended for use in high performance and high load operating conditions in both outboard and I/O lower units.
  • Resists oxidation to ensure high performance over a wide range of ambient operating temperatures.
  • OMC (System Matched) Ultra-HPF Blend.

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West Marine

Product Details

Specifications

Details
Model Oils & Lubes
Publication Legacy Item Number 18-9650-2
Oil Grade Synthetic Blend
Oil Weight 80W90
Product Style Gear Lubricant

Reviews From Real Customers

Paul R.
Clifford L.
JAY H.

19. Lucas Oil Marine Gear Oil Synthetic M8 1 Quart 10652

Lucas Oil Marine Gear Oil Synthetic M8 1 Quart 10652

  • Has higher lubricity for faster acceleration and more RPM’s
  • Designed for use in both petrol and diesel engines
  • Lowers oil
  • Meets or Exceeds American and European OEM specifications
  • Provides a tougher, thicker oil film for maximum protection against metal to metal contact

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NAPA Auto Parts

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Details
Weight 2.01 oz

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walt7265
Tommyboy

20. West Marine Lower Unit Lube Tube

West Marine Lower Unit Lube Tube

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West Marine

Product Details

Reviews From Real Customers

Big_Port
viper mike
pkastle

Conclusion

The conclusion of lower unit oil for mercury outboard is that it is a great way to keep your boat running smoothly and efficiently. Lower unit oil helps to lubricate the gears and moving parts in your outboard motor, and it also helps to keep the water in your boat clean and free of debris.

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