Mercury – 10W-30 Marine Oil | Four-Stroke Engine Lubrication | 92-8M0078616

Overview

This quart of 10W-30 is a straightforward option for routine service on four-stroke marine engines. It’s blended for how boats actually get used—long idle times, warm cruising, and plenty of moisture hanging around the powerhead. Fresh oil helps these motors settle into a smoother idle and run a little cleaner when you roll into the throttle. Nothing complicated about it, just a solid marine-grade oil that does its job.

Key Features

 • Four-Stroke Marine Blend – Works with outboards, sterndrives, and inboards.
 • Corrosion & Wear Protection – Helps internal parts stay clean and resist moisture.
 • Stable Viscosity – Holds its weight well during long warmups and steady cruising.
 • 10W-30 Rating – Easy cold starts with dependable protection when hot.
 • One-Quart Bottle – Good for top-offs or smaller oil-capacity motors.

Engine & Boat Compatibility

 • Four-stroke outboards
 • Four-stroke sterndrives
 • Four-stroke inboards
 • Engines calling for 10W-30 marine oil

Performance & Practical Benefits

After an oil change with this blend, the engine usually feels more settled—less chatter at idle and a smoother tone as it warms up. It helps keep moisture from creeping into the wrong places, which is something all boat motors battle. Over the season, it maintains a predictable feel, especially on motors that see a mix of slow trolling and long, steady runs.

Why Buy OEM

Mercury formulates this oil around the conditions their engines see day-to-day: heat, humidity, long idle periods, and today’s fuel blends. OEM oil keeps pressure and temperature behavior consistent so the motor operates the way it was designed to.

FAQ

Q1: When should I change the oil?
When it darkens, starts to smell burnt, or you’ve reached your hour interval.

Q2: Should I add anything to it?
No—this formula already covers marine four-stroke needs.

Q3: How does it do in saltwater?
It includes corrosion protection made for salty environments.

Q4: Any tips for cleaner draining?
Warm the engine a bit first so the oil flows out more smoothly.

Q5: What happens if I stretch the oil change too long?
The motor may idle rough, run hotter, or wear out faster than it should.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.