Mercury – 10W-30 4-Stroke Mineral Marine Engine Oil, 1 Gallon | FourStroke Lubrication Series | Mineral Base Oil 10W-30 | 8M0078626

Overview

A good day on the water starts with an engine you don’t have to think about. Turn the key, let it settle into a smooth idle, and you can focus on the fun stuff—finding fish, chasing sunsets, or just getting the family to the sandbar without a second worry. The truth is, marine engines live in a world that’s always trying to wear them down: humidity, salt air, long idle time, and hard runs when the weather changes fast. That’s why the right oil matters. This Mercury Marine part is built to protect your four-stroke the way boating actually happens, not the way it looks in a brochure.

Key Features

• Four-stroke marine engine oil formulated for harsh, corrosive marine environments
• Mineral base oil with a marine-focused additive package to help prevent corrosion
• Viscosity rating: 10W-30
• Designed to provide strong wear protection to help extend engine life
• Built for excellent strength and viscosity retention under marine operating stress
• Certified to meet FC-W standards and catalyst compatible FC-W standards
• Meets manufacturer requirements for four-stroke marine engines where 10W-30 is specified
• One-gallon container for convenient oil changes and storage
• Produced by Mercury Marine to original equipment manufacturer specifications
• Mercury Marine part number 8M0078626

Engine & Boat Compatibility

• Recommended for Mercury four-stroke outboards where 10W-30 is called for
• Suitable for many other leading-brand four-stroke marine engines that specify 10W-30
• Works for outboard, sterndrive, and inboard applications when the manual calls for this grade
• Common on pontoons, fishing boats, skiffs, runabouts, and family cruisers

Performance & Practical Benefits

You might not “feel” oil the way you feel a prop or steering, but you definitely feel the results. With the right 10W-30 marine oil, starts tend to be cleaner, idle feels steadier, and the engine stays more consistent as the day heats up. The 10W-30 viscosity is a great fit for many four-stroke setups because it flows well on start-up while still providing dependable protection once the engine is warm and working.

Where this oil really shines is corrosion protection. Boats sit between trips, and that downtime is when moisture can do sneaky damage. A marine-specific additive package helps fight corrosion on and off the water, which is exactly what weekend boaters need. It also helps keep protection stable through normal boating stress—short runs, long cruises, plenty of idling, and the occasional push when the weather turns and you need to get home.

The one-gallon size keeps maintenance practical. No juggling multiple bottles, no guessing if you have enough on hand. It’s simple, tidy, and easy to store for the next service.

Why Buy OEM

If you’re trying to keep your engine healthy for the long haul, OEM oil is a smart move. This is a genuine Mercury Marine part made to original equipment manufacturer specifications and certified to meet recognized marine standards, including FC-W and catalyst compatible requirements. Aftermarket oils can vary widely, and automotive oils often miss the mark in corrosion protection. OEM keeps it straightforward: correct formulation, consistent performance, and protection designed for the marine environment.

FAQ Section

Q1: Which Mercury engines or systems does the 10W-30 Mineral Marine Engine Oil fit?

It’s intended for four-stroke marine engines—outboard, sterndrive, or inboard—where 10W-30 is specified. It’s commonly used in Mercury four-stroke applications.

Q2: What makes this part different from aftermarket alternatives?

It’s produced by Mercury Marine to original equipment manufacturer specifications and certified to meet FC-W and catalyst compatible standards, with corrosion-focused marine additives.

Q3: How do I know if this is the correct replacement for my setup?

Check your owner’s manual for the required viscosity. If it calls for 10W-30, match the part number to 8M0078626.

Q4: Can this be used in both saltwater and freshwater applications?

Yes. It’s designed for marine use in either environment, with corrosion protection that’s especially valuable in saltwater.

Q5: Is installation straightforward for most boat owners?

Yes. Use it as you would any marine engine oil during routine service. Follow your manual for capacity, intervals, and proper disposal.