Mercury – 300 Hour Maintenance Kit | MerCruiser 5.0L, 5.7L & 6.2L MPI Bravo Series | OEM Service Components | 8M0147069

Overview

There’s something comforting about an engine that responds exactly the way you expect. When you ease the throttle forward and your MerCruiser MPI settles into that smooth, confident push, it’s a reminder of why upkeep matters. The Mercury 8M0147069 300 Hour Maintenance Kit brings that peace of mind into one tidy box. It’s crafted for boaters who’d rather spend their time out past the breakwater or riding a late-day chop than hunting down individual service parts. Everything you need is here, built to the same standard as the engine you trust every weekend.

Key Features

• Complete 300-hour service kit for MerCruiser MPI engines
• Includes oil filter, fuel filter, serpentine belt, spark plugs, thermostat, thermostat gasket, gearcase drain seals, and seawater pump impeller kit
• High-pleat filters deliver superior debris and water control
• Heavy-duty electroplated housings resist corrosion season after season
• Exact OEM fit designed for predictable, dependable installation

Engine & Boat Compatibility

• Fits MerCruiser 5.0L, 5.7L, and 6.2L MPI engines made by General Motors
• Compatible with Bravo sterndrives (2002 and newer)
• Ideal for sport boats, cruisers, bowriders, coastal fishing boats, and runabouts powered by these MPI platforms

Performance & Practical Benefits

If you’ve spent enough seasons on the water, you can feel the difference between an engine that’s “fine” and one that’s truly dialed in. This kit brings the engine back to that dialed-in state. Fresh spark plugs sharpen throttle response, especially when you jump on plane or push through a headwind. A new impeller restores healthy cooling flow, helping the engine run cool and steady even during long cruises at higher RPMs.

The new serpentine belt is one of those items you never want to skip—when a belt goes, so does everything it drives. Replacing it now keeps your alternator, raw-water pump, and accessories spinning tight and smooth. The filters handle the quiet work in the background, protecting injectors, internal passages, and gearcase components from moisture and grit that can slowly rob performance.

Each item slips into place exactly where it belongs. No guessing. No odd fittings. Just clean, secure installs that get you back on the water with confidence.

Why Buy OEM

OEM Mercury components aren’t just “compatible”—they’re built to the same engineering standard as the original parts in your engine. That means better long-term reliability, predictable service intervals, and fewer headaches during the season. Aftermarket parts may be cheaper, but the cost of a mid-summer breakdown far outweighs the small difference in price. With OEM, you know you’re putting the right materials, dimensions, and tolerances back into your engine.

FAQ

Q1: Which engines does this kit fit?

It fits MerCruiser 5.0L, 5.7L, and 6.2L MPI engines paired with Bravo sterndrives, 2002 and newer.

Q2: Why is OEM better than aftermarket?

OEM parts fit perfectly, last longer, and match Mercury’s engineering standards—something aftermarket options often miss.

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

If your engine is MPI and your boat uses a Bravo drive (model year 2002 or newer), this is the correct 300-hour kit.

Q4: Can it be used in saltwater?

Absolutely. All components are engineered for freshwater and saltwater environments.

Q5: Is installation beginner-friendly?

If you’re comfortable doing regular maintenance, this kit installs cleanly using standard tools.