Mercury – 3.0L 150hp EFI FourStroke 300 Hour Maintenance Kit | Complete Outboard Service Kit | Premium Marine Components | 8M0163132

Overview

If you run a Mercury 150 FourStroke, you already know how much trust that engine earns. It’s the motor that gets you through choppy afternoons, long drifts over your favorite fishing spots and slow evening cruises back toward the ramp. But even the most dependable outboards need proper care — especially the ones that rack up serious hours. The Mercury Marine part number 8M0163132 300 Hour Maintenance Kit brings everything together in one clean package, giving you the confidence of knowing your engine is protected and ready for whatever the next season brings.

Key Features

• Complete 300-hour service kit for Mercury 3.0L 150hp EFI FourStroke outboards
• Fits engines with serial number 1B905505 and above
• Includes oil filter, fuel filter, oil drain seals, spark plugs, thermostat, alternator belt and water pump impeller repair kit
• No anodes included (sold separately based on application)
• Designed to match factory specifications for proper fit and long-term reliability

Engine & Boat Compatibility

• Built for Mercury 150hp EFI FourStroke 3.0L outboards
• Popular on center consoles, bay boats, pontoons, fishing boats, offshore skiffs and family runabouts
• Ideal for owners who run heavy-hour engines or push their equipment through demanding conditions
• Designed for outboards requiring OEM 300-hour service components

Performance & Practical Benefits

A 300-hour service can feel like a reset for your engine — that moment when everything comes back into sync. This kit gathers the parts that make the biggest difference in how your 150 runs day after day. Fresh spark plugs sharpen throttle response. A new fuel filter keeps your fuel system breathing cleanly, reducing hesitation and keeping your engine running smooth and steady. The oil filter and drain seals help lock in clean lubrication, giving your internals the protection they need for long, hot runs.

One of the biggest gains comes from the water pump impeller repair kit. A healthy impeller brings back strong, consistent cooling — something you’ll feel in the engine’s temperature stability, especially during long idle zones or high-rpm runs. The new thermostat plays a big role too, restoring proper warm-up behavior and keeping your engine operating exactly where it should.

The alternator belt is another piece boaters sometimes overlook. Replacing it restores that confident, slip-free drive to your charging system. You’ll hear the difference as the belt settles into place, running tight and quiet.

Completing this 300-hour service with OEM parts means fewer surprises on the water and fewer headaches during the season. Everything fits right, torques down cleanly and performs with the consistency you expect from Mercury.

Why Buy OEM

When you’re trusting an engine to carry your family, your gear and your day’s plans, OEM parts are the only smart choice. Mercury designs these components with exact tolerances, ensuring they fit tight, work right and last longer than aftermarket substitutes. Cheaper parts may look similar, but they rarely offer the same long-term reliability — especially under marine stress. If a friend at the dock asked for your honest advice, you’d probably tell them the same thing: use the parts Mercury built for your motor, and you’ll keep your engine running strong for years.

FAQ

Q1: Which engines does this maintenance kit fit?

It fits Mercury 3.0L 150hp EFI FourStroke outboards with serial number 1B905505 and above.

Q2: What makes this OEM kit better than aftermarket alternatives?

Every part matches factory specifications, ensuring better durability, fitment and long-term reliability.

Q3: How do I confirm this is the correct kit?

Check your serial number. If your 150 FourStroke is 1B905505 or newer, this Mercury Marine part number is the correct match.

Q4: Is this kit suitable for both freshwater and saltwater applications?

Yes — all components are designed for marine environments. Anodes must be purchased separately based on your water type.

Q5: Is installation manageable for most boat owners?

If you’re comfortable performing routine maintenance, this kit installs cleanly with factory-fit components.