Mercury – 300 Hour Maintenance Kit | 3.4L V6 FourStroke Series | OEM Components | 8M0149930

Overview

Ask anyone who spends real time on the water — the kind of boater who racks up hours chasing tide changes, hauling gear, or running a busy charter — and they’ll tell you the same thing: long-term reliability doesn’t happen by accident. It’s built through routine care and the right parts. The Mercury 8M0149930 300 Hour Maintenance Kit gives you that confidence you only get when you know your engine has been serviced with exactly what it needs. Whether you’re heading out before sunrise or easing in as the last boats are tying up, there’s a quiet peace that comes with knowing your 3.4L V6 FourStroke is protected, refreshed, and ready for whatever tomorrow brings.

Key Features

• Complete 300-hour service kit for Mercury 3.4L V6 FourStroke outboards
• Includes oil filter, fuel filter, thermostat, spark plugs, alternator belt, oil drain seal, anodes, and water pump repair kit
• High internal pleat-count filters for stronger debris capture
• Heavy-duty electroplated housings to prevent corrosion
• Engineered and approved to exact Mercury Marine part standards

Engine & Boat Compatibility

• Designed for Mercury 3.4L V6 FourStroke 175–225–300hp outboards
• Fits engines with serial number 2B529482 and higher
• Ideal for bay boats, offshore center consoles, pontoons, multi-engine rigs, aluminum fishing boats, and coastal service vessels

Performance & Practical Benefits

A 300-hour service isn’t just routine maintenance—it’s a reset button for your engine’s health. Once this kit is installed, you’ll notice how clean and steady the motor feels. The fresh spark plugs snap the combustion back into sync. The new fuel and oil filters clear out buildup that slowly robs efficiency. The thermostat restores proper cooling flow, and the water pump repair kit ensures your engine stays calm and controlled, even during long summertime pushes at higher RPM.

Everything feels tighter, smoother, and more responsive. That steady V6 thrum at idle comes back. Hole-shot performance feels sharper. Even gear shifts seem more deliberate and clean. And because the kit includes replacement anodes, you also restore critical corrosion protection — a must for anyone running brackish or saltwater.

Mercury builds parts that hold up to rough chop, hot days, long drifts, and quick runs between spots. This maintenance kit is designed to match that same standard. Every component installs cleanly and predictably, without forcing or modification. It’s a straightforward service that gives your engine another long stretch of worry-free hours.

Why Buy OEM

When it’s time for a 300-hour service, cutting corners never pays off. Mercury OEM parts give you the exact fit and long-term quality your engine was engineered around.

• Precise fitment for confident installation
• Guaranteed filtration and cooling performance
• Long-term reliability in harsh marine environments
• Better lifespan than many aftermarket alternatives
• Protects your investment and helps maintain warranty compatibility

Think of it as giving your FourStroke the same care Mercury technicians would — smart, thorough, and built to last.

FAQ

Q1: Which engines does this maintenance kit fit?

It fits Mercury 3.4L V6 FourStroke outboards, serial number 2B529482 and higher.

Q2: What sets this OEM kit apart from aftermarket options?

OEM Mercury components offer proven durability, corrosion resistance, and exact engineering tolerances.

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

Match your outboard’s serial number to the required range; if it’s 2B529482 or higher, this is the correct kit.

Q4: Is this kit suitable for saltwater and freshwater use?

Absolutely — the included anodes and corrosion-resistant components make it ideal for all environments.

Q5: Is installation straightforward?

Yes. Each part is designed for a perfect fit, making this a clean, predictable service for most boat owners.