Mercury – 300 Hour Maintenance Kit | L6 Verado EFI Series | Marine-Grade Components | 8M0133617

Overview

Most boaters will tell you there’s nothing quite like the confidence that comes from a well-maintained engine. When you turn the key and your Verado wakes up without hesitation, there’s a calm satisfaction that settles in — the kind you only get from staying ahead on your service schedule. The Mercury Marine part 8M0133617 maintenance kit is built for that peace of mind. It gathers every critical piece you need for a 300-hour service into one box, so you’re not hunting for parts or wondering what you missed. Whether you’re pushing offshore at sunrise or cruising a quiet river with the family, it’s the kind of reliability that keeps the day simple.

Key Features

• Complete 300-hour service kit for Mercury L6 200–300 horsepower Verado EFI outboards
• Includes oil filter, low- and high-pressure fuel filters, gearcase drain seals, spark plugs (6), thermostat kit, water pump impeller kit, alternator belt, and anodes
• Engineered to match factory specifications for Verado performance and longevity
• High internal pleat-count filtration components for cleaner oil and fuel flow
• Durable, corrosion-resistant housings designed for harsh marine environments
• Compatible with serial numbers 2B144123 through 2B578935

Engine & Boat Compatibility

• Mercury L6 Verado 200 horsepower
• Mercury L6 Verado 225 horsepower
• Mercury L6 Verado 250 horsepower
• Mercury L6 Verado 275 horsepower
• Mercury L6 Verado 300 horsepower
• Suitable for center consoles, coastal fishing boats, offshore rigs, pontoons, and performance hulls using the inline-six Verado platform

Performance & Practical Benefits

There’s something reassuring about completing a full service with all the right parts laid out in front of you. This Mercury kit takes the guesswork out of the job. Every filter fits the way it should, every gasket matches the footprint, and every part is built to handle the heat, vibration, and salt that Verado engines are known to push through. When everything is replaced at the same interval, the engine just runs smoother — the idle feels more even, throttle response sharpens, and fuel efficiency tends to settle into a more predictable pattern.

The water-pump impeller and thermostat kit help maintain steady cooling, especially important for bigger Verado engines that spend long stretches at higher RPM. The spark plugs bring back crisp ignition, while the filters keep debris out of places it doesn’t belong. Altogether, it’s a simple, complete way to protect a major investment and ensure the engine is ready for whatever the next season brings.

Why Buy OEM

A maintenance kit is only as good as the parts inside it, and factory components are built with tighter tolerances, better filtration media, and materials designed specifically for Verado systems. Mercury’s OEM parts are tested in conditions far harsher than most boaters will ever encounter, so when you open the box, you know everything is designed to work together as a system. Aftermarket kits may look similar, but they can vary in quality, fit, and longevity — all things that matter when you rely on your engine to bring you home. With an OEM kit, you’re investing in consistency, proper fitment, and long-term performance.

FAQ

Q1: Which engines does the 8M0133617 kit fit?

It’s designed for Mercury L6 Verado 200–300hp EFI outboards with serial numbers 2B144123 through 2B578935.

Q2: What makes this kit better than aftermarket options?

Everything inside is factory-engineered with the correct filtration levels, materials, and tolerances for Verado systems.

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

Match your engine’s serial number to the listed range. If it falls between those numbers, this is the right kit.

Q4: Is it suitable for both saltwater and freshwater?

Yes — every component is built for tough marine environments, including salt, heat, and heavy use.

Q5: Can most boaters install it themselves?

If you’re comfortable doing standard marine maintenance, this kit lays everything out clearly and fits easily.