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

Overview

Every boater knows there’s a certain peace you feel when your engine starts clean and settles into that smooth, steady rhythm. It is the sound that tells you the day is off to a good start and the water ahead is yours to enjoy. Mercury 10W-30 4-Stroke Mineral Marine Engine Oil, part number 8M0078625, is one of those behind-the-scenes essentials that keeps that confidence alive. Whether you are easing away from the marina or running a long line of open water, this oil helps your engine stay protected, responsive, and ready for the miles ahead.

Key Features

• Mineral-based four-stroke marine engine oil

• Designed to reduce wear and resist corrosion in harsh marine environments

• Strong viscosity retention for steady lubrication under heat and load

• Ten weight thirty viscosity

• One quart bottle

• Mercury Marine part number 8M0078625

• Certified FC-W and FC-W Catalyst Compatible

Engine & Boat Compatibility

• Suitable for most Mercury four-stroke outboards across common horsepower ranges

• Works with Mercury sterndrive and inboard systems requiring 10W-30 oil

• Compatible with other major marine engine brands using four-stroke lubrication

• Commonly used on pontoons, bass boats, bay boats, offshore center consoles, runabouts, and family cruisers

Performance & Practical Benefits

When you spend time on the water, you start to feel how much your engine depends on the right oil. This mineral blend keeps internal components cushioned with a smooth, secure film that protects against friction and premature wear. The viscosity stays steady even during long stretches of high-rpm running, so performance feels predictable instead of strained. You will notice the difference in the way the engine warms up smoothly and pulls cleanly through the mid-range.

Marine environments are unforgiving, and that is where this oil’s corrosion protection really proves itself. Moisture, salt, and heat can slowly eat away at unprotected components, but this formulation helps create a barrier that keeps the internals cleaner and more stable over time. That means easier maintenance, longer engine life, and fewer surprises when you pull the cowling off for routine service. It is the kind of everyday reliability that makes boating feel simpler and far more enjoyable.

Why Buy OEM

Choosing a genuine Mercury Marine part is choosing a product built for the realities of marine use — not just general automotive conditions. OEM oil is engineered to meet the demands of Mercury engines, from cool morning starts to long, hot runs under load. Aftermarket blends may claim broad compatibility, but they often lack the testing and refinement needed for marine environments. With Mercury oil, you get long-term durability, consistent performance, and the peace of mind that comes from using something designed to fit and function perfectly the first time. Any experienced boater will tell you: protecting your engine starts with the oil you trust.

FAQ

Q1: Which Mercury engines does Mercury 10W-30 Mineral Marine Engine Oil fit?
It fits most Mercury four-stroke outboards, sterndrives, and inboards that specify a ten weight thirty oil.

Q2: What makes this oil different from aftermarket options?
It offers stronger corrosion resistance, better viscosity stability, and protection tailored for the harsh, wet conditions marine engines face.

Q3: How do I know if this is the correct oil for my setup?
Check your engine manual. If it lists ten weight thirty for four-stroke lubrication, this is the proper match.

Q4: Can it be used in both saltwater and freshwater?
Yes, it is formulated to perform reliably in either environment.

Q5: Is installation straightforward for most boat owners?
Absolutely. If you are comfortable performing a routine oil change, this oil pours and handles easily.