Mercury – 300 Hour Maintenance Kit | L6 Verado Series | OEM Components | 8M0149428

Overview

If you’ve spent enough time behind the helm of a Verado, you know that nothing feels quite like the smooth push of an in-line six as it settles into its rhythm. And when you rely on your engine for long runs, heavy-duty schedules, or week-after-week usage, staying ahead on maintenance isn’t optional—it’s the heartbeat of your confidence on the water. The Mercury 8M0149428 Select L6 Verado 300 Hour Maintenance Kit brings that peace of mind straight to your hands, giving you everything you need for a major service without the extras you don’t. It’s built for boaters who run hard, rack up hours fast, and understand the value of a well-kept engine.

Key Features

• Complete 300-hour maintenance kit designed for Mercury L6 Verado outboards
• Contains oil filter, fuel filter, oil drain seals, spark plugs, thermostat, alternator belt and a water pump impeller repair kit
• Designed without anodes for owners who do not need replacements every service interval
• Engineered and packaged by Mercury for exact fit, proper performance and long-term reliability
• All components meet Mercury Marine part and material specifications

Engine & Boat Compatibility

• For Mercury in-line 6-cylinder Verado outboards
• Compatible with serial numbers 2B144123 through 2B578935
• Ideal for multi-engine offshore boats, performance center consoles, heavy-use family cruisers and commercial vessels
• Perfect for boaters who log high annual hours or operate in demanding conditions

Performance & Practical Benefits

This kit brings the major service tasks together in one straightforward package, which means fewer trips to the parts counter and no second-guessing whether you grabbed the right filter or belt. Every item is designed to fit tightly, install smoothly and restore the crisp, steady feel your Verado delivered on day one.

The new fuel filter helps maintain clean delivery under load, especially during long runs or when the sea gets rough. Fresh spark plugs bring back that quick throttle response you feel when you tap the binnacle. The thermostat, impeller components and alternator belt all work together to keep temperatures stable, water flow strong and electrical output reliable. You’ll feel the difference in small ways—cooler idle temps, sharper acceleration, smoother mid-range power. It’s the kind of quiet improvement that adds up to big confidence when you’re miles from the dock.

Durability is another standout. These components are built for real marine environments, with corrosion-resistant materials and engineering designed to handle salt, heat and vibration. This kit keeps your Verado steady and secure, whether you’re cruising, trolling or pushing offshore into open water.

Why Buy OEM

When you’re maintaining a premium engine like the Verado, cutting corners just doesn’t make sense. OEM parts are built to Mercury’s exact tolerances, which means they fit right the first time and deliver the performance your outboard was designed for. Aftermarket kits may cost less up front, but they often lack the consistency, filtration quality and durability that a long-running engine demands.

Choosing this genuine Mercury Marine part ensures predictable service intervals, long-term reliability and fewer headaches on the water. It’s the same advice you’d hear from seasoned captains—stick with OEM, and you’ll spend more time boating and less time troubleshooting.

FAQ

Q1: Which Mercury engines does this kit fit?

It’s made for Mercury in-line 6-cylinder Verado outboards with serial numbers 2B144123 through 2B578935.

Q2: What makes this kit different from aftermarket options?

Every component meets Mercury’s engineering specs, offering better fit, better longevity and better protection.

Q3: How do I know if this is the right kit for my engine?

Match your engine’s serial number to the specified range and confirm you don’t require anode replacements in this interval.

Q4: Can it be used in saltwater and freshwater boats?

Absolutely—the components are built for long-term durability in both environments.

Q5: Is installation straightforward?

Yes. Most experienced boat owners—or a trusted technician—can complete the 300-hour service using the items in the kit.