Mercury – 300 Hour Maintenance Kit (No Anodes) | Verado L6 Series | OEM Service Components | 8M0149427

Overview

There’s a certain peace that comes from knowing your engine is cared for the same way Mercury intended. When you’re running a big Verado, you don’t want shortcuts or guesswork—you want parts that keep the engine smooth, predictable and ready for whatever the day brings. The Mercury 300 Hour Maintenance Kit 8M0149427 delivers that confidence. It gathers every essential service item you need for a major interval, without the extra anodes you may not require. It’s clean, complete and built for boaters who simply want their engine to run right.

Key Features

• Complete 300-hour service kit (anode-free version)
• Includes oil filter, fuel filter, oil drain seals, spark plugs, thermostat and alternator belt
• Contains a full water pump impeller repair kit
• Mercury-tested components for fit and longevity
• Designed for heavy-usage outboards that demand reliable service intervals

Engine & Boat Compatibility

• For Mercury in-line 6-cylinder 200–300hp Verado outboards
• Fits models with serial number 2B144122 and below
• Ideal for offshore center consoles, bay boats, pontoon rigs and performance craft
• Suitable for commercial SeaPro setups that run high hours

Performance & Practical Benefits

A 300-hour service isn’t something you take lightly—especially with a Verado. This kit gives you everything you need to keep the engine running tight and responsive, without tracking down individual parts. The included filters hold strong under high RPM cruising and idle time alike, catching fine debris before it can work its way into sensitive systems.

The thermostat and impeller kit help maintain steady cooling flow, which you’ll feel in consistent temperature readings and smoother long-run performance. And the updated alternator belt ensures the kind of dependable charging your electronics expect on long days offshore. When all these pieces work together, your engine feels settled—no surging, no hesitation, just steady push and clean throttle response.

Because the kit doesn’t include anodes, you’re free to replace them on your own schedule, which makes sense for owners who track wear closely or run mostly freshwater. Everything else is here, neatly packaged, ready to install without the back-and-forth runs to the parts counter.

Why Buy OEM

Mercury OEM components aren’t just built to fit—they’re engineered as part of the system. Using the parts Mercury intended means tolerances line up, seals don’t leak and your engine performs the same way it did on day one. Aftermarket bundles may look tempting, but they often cut corners on filter media, impeller materials or gasket quality.

If a buddy on your dock asked for real-world advice, you’d probably tell them this: “For a major service, don’t risk it. Stick with Mercury OEM and you’ll only do the job once.”

FAQ

Q1: Which Mercury engines does this kit fit?

It fits in-line 6-cylinder 200–300hp Verado models with serial number 2B144122 and below.

Q2: Why doesn’t this kit include anodes?

It’s designed for owners who prefer replacing anodes on a different schedule or who don’t need them at this interval.

Q3: How can I confirm this is the correct kit for my engine?

Check your serial number and ensure your engine is an L6 Verado within the listed range.

Q4: Is it suitable for both saltwater and freshwater boats?

Absolutely. All components are engineered for full marine exposure.

Q5: Is installation straightforward?

If you’ve done routine maintenance before, this kit is clear and manageable. A service manual helps with torque specs and procedures.