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10 Best Mercury 4 Stroke Engine Oil of 2025

Tested and Reviewed: Top 10 Mercury 4 Stroke Engine Oil deals with expert ratings from 8.1 to a perfect 10

March 2026 Edition

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1

Editor's Choice

9.7

Mercury 25W-40 4-Stroke Synthetic Blend Marine Engine Oil, 1 Gallon - 8M0078630

MERCURY

Mercury 25W-40 4-Stroke Synthetic Blend Marine Engine Oil, 1 Gallon - 8M0078630

Editor's bottom line:

“This mercury 4 stroke engine oil is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

For use in Mercury, MerCruiser and other leading brands of four-stroke outboard, sterndrive and inboard marine engines
Provides outstanding wear and corrosion protection to help extend engine life
Maintains viscosity, protects against varnish buildup and sludge formation, and exceeds the rust protection requirements for NMMA certification
Outperforms automotive oils in marine applications thanks to its specialized additive package designed for the rigors of the marine environment
Produced by Mercury Marine to our stringent original equipment manufacturer specifications
Mercury oils, lubricants and engine care products are backed by decades of experience in engineering, testing and manufacturing to provide the best protection and performance.

Picked by 397 people today

2

9.5

Quicksilver 10W-30 4-Stroke Marine Engine Oil, 1 Gallon

Quicksilver

Quicksilver 10W-30 4-Stroke Marine Engine Oil, 1 Gallon

Main Highlights

Designed for use with all 4-stroke marine outboard motors and inboard and sterndrive engines
Formulated to protect marine engines against corrosion and excessive wear
Offers outstanding shear strength, viscosity retention and corrosion resistance
10W-30 viscosity
Manufacturer part number 8M0078617

3

9.5

Mercury 25W-40 4-Stroke Synthetic Blend Marine Engine Oil, 1 Quart - 8M0078629

MERCURY

Mercury 25W-40 4-Stroke Synthetic Blend Marine Engine Oil, 1 Quart - 8M0078629

Main Highlights

For use in Mercury, MerCruiser and other leading brands of four-stroke outboard, sterndrive and inboard marine engines
Provides outstanding wear and corrosion protection to help extend engine life
Maintains viscosity, protects against varnish buildup and sludge formation, and exceeds the rust protection requirements for NMMA certification
Outperforms automotive oils in marine applications thanks to its specialized additive package designed for the rigors of the marine environment
Produced by Mercury Marine to our stringent original equipment manufacturer specifications
Mercury oils, lubricants and engine care products are backed by decades of experience in engineering, testing and manufacturing to provide the best protection and performance.

4

9.2

Mercury 10W-30 4-Stroke Mineral Marine Engine Oil, 1 Gallon - 8M0078626

MERCURY

Mercury 10W-30 4-Stroke Mineral Marine Engine Oil, 1 Gallon - 8M0078626

Main Highlights

This mineral base oil is for use in four-stroke engines from Mercury and other leading brands
Provides outstanding wear and corrosion protection to help extend engine life
Industry-leading strength and viscosity retention
Exceeds all marine engine manufacturer warranty requirements and recommendations and is certified FC-W and FC-W Catalyst Compatible
Produced by Mercury Marine to our stringent original equipment manufacturer specifications
Mercury oils, lubricants and engine care products are backed by decades of experience in engineering, testing and manufacturing to provide the best protection and performance.

5

9.0

Mercury 10W-30 4-Stroke Mineral Marine Engine Oil, 1 Quart - 8M0078625

MERCURY

Mercury 10W-30 4-Stroke Mineral Marine Engine Oil, 1 Quart - 8M0078625

Main Highlights

This mineral base oil is for use in four-stroke engines from Mercury and other leading brands
Provides outstanding wear and corrosion protection to help extend engine life
Industry-leading strength and viscosity retention
Exceeds all marine engine manufacturer warranty requirements and recommendations and is certified FC-W and FC-W Catalyst Compatible
Produced by Mercury Marine to our stringent original equipment manufacturer specifications
Mercury oils, lubricants and engine care products are backed by decades of experience in engineering, testing and manufacturing to provide the best protection and performance.

6

8.8

Quicksilver 10W-30 4-Stroke Synthetic Blend Marine Engine Oil, 1 Gallon

Quicksilver

Quicksilver 10W-30 4-Stroke Synthetic Blend Marine Engine Oil, 1 Gallon

Main Highlights

Formulated to protect against corrosion and excessive wear
Designed for use with all 4-stroke marine engines
Offers outstanding strength and viscosity retention
10W-30 viscosity
Manufacturer part number 8M0142146

7

8.6

Mercury 25W-40 4-Stroke Marine Engine Oil, 1 Gallon - 8M0078628

MERCURY

Mercury 25W-40 4-Stroke Marine Engine Oil, 1 Gallon - 8M0078628

Main Highlights

For use in Mercury, MerCruiser and other leading brands of four-stroke outboard, sterndrive and inboard marine engines
Provides outstanding wear and corrosion protection to help extend engine life
Industry-leading strength and viscosity retention
Exceeds all marine engine manufacturer warranty requirements and recommendations and is certified FC-W and FC-W Catalyst Compatible
Produced by Mercury Marine to our stringent original equipment manufacturer specifications
Mercury oils, lubricants and engine care products are backed by decades of experience in engineering, testing and manufacturing to provide the best protection and performance.

8

8.3

Quicksilver 25W-40 4-Stroke Marine Engine Oil, 1 Gallon

Quicksilver

Quicksilver 25W-40 4-Stroke Marine Engine Oil, 1 Gallon

Main Highlights

Direct replacement for Mercury Marine 8M0078628
Designed for use in 4-stroke marine engines
Formulated to provide superior corrosion resistance and wear protection to maintain peak engine performance and reliability
Special viscosity modifiers help to optimize the performance of high-rpm 4-stroke outboard motors
25W-40 viscosity
Produced to meet Mercury Marine original equipment manufacturer specifications to best protect your outboard
Manufacturer part number 8M0078620

9

8.1

Mercury 25W-40 4-Stroke Marine Engine Oil, 1 Quart - 8M0078627

MERCURY

Mercury 25W-40 4-Stroke Marine Engine Oil, 1 Quart - 8M0078627

Main Highlights

For use in Mercury, MerCruiser and other leading brands of four-stroke outboard, sterndrive and inboard marine engines
Provides outstanding wear and corrosion protection to help extend engine life
Industry-leading strength and viscosity retention
Exceeds all marine engine manufacturer warranty requirements and recommendations and is certified FC-W and FC-W Catalyst Compatible
Produced by Mercury Marine to our stringent original equipment manufacturer specifications
Mercury oils, lubricants and engine care products are backed by decades of experience in engineering, testing and manufacturing to provide the best protection and performance.

10

8.1

Quicksilver 25W-40 4-Stroke Synthetic Blend Marine Engine Oil, 1 Quart

Quicksilver

Quicksilver 25W-40 4-Stroke Synthetic Blend Marine Engine Oil, 1 Quart

Main Highlights

Direct replacement for Mercury Marine 8M0078629
Designed for use in 4-stroke marine engines
Synthetic blend formulated to provide ultimate corrosion resistance and wear protection in high-rpm 4-stroke outboard motors
Offers industry-leading strength and viscosity retention to maintain peak engine performance and reliability
25W-40 viscosity
Produced to meet Mercury Marine original equipment manufacturer specifications to best protect your outboard
Manufacturer part number 8M0078622

Our Best Overall Choice

9.7

Mercury 25W-40 4-Stroke Synthetic Blend Marine Engine Oil, 1 Gallon - 8M0078630

MERCURY

Mercury 25W-40 4-Stroke Synthetic Blend Marine Engine Oil, 1 Gallon - 8M0078630

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

For use in Mercury, MerCruiser and other leading brands of four-stroke outboard, sterndrive and inboard marine engines
Provides outstanding wear and corrosion protection to help extend engine life
Maintains viscosity, protects against varnish buildup and sludge formation, and exceeds the rust protection requirements for NMMA certification
Outperforms automotive oils in marine applications thanks to its specialized additive package designed for the rigors of the marine environment
Produced by Mercury Marine to our stringent original equipment manufacturer specifications
Mercury oils, lubricants and engine care products are backed by decades of experience in engineering, testing and manufacturing to provide the best protection and performance.

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Mercury 25W-40 4-Stroke Synthetic Blend Marine Engine Oil, 1 Gallon - 8M0078630

Special Amazon deal ends in: