Mercury – 25W-40 4-Stroke Oil Change Kit | L6 Verado Series | Marine-Grade Components | 8M0188359

Overview

There’s something deeply satisfying about giving your outboard the kind of care that keeps it running strong season after season. When you’re cruising offshore or sliding into a quiet cove, you want the comfort of knowing your engine is protected from the inside out. An oil change may not be the flashiest part of boating, but it’s one of those simple routines that keeps everything smooth, steady, and trustworthy. With the Mercury Marine part 8M0188359 Oil Change Kit, you get a complete, ready-to-go package made specifically for the powerful L6 Verado platform. It’s the kind of kit that turns a basic maintenance task into a quick, confident job you’ll feel good about.

Key Features

• Complete OEM oil change kit for Mercury L6 two-hundred to four-hundred horsepower Verado outboards
• Includes seven one-liter bottles of Mercury twenty-five-W forty four-stroke marine engine oil
• Premium Mercury oil filter designed for precise marine lubrication demands
• Drain plug seal, drip tray, and clear step-by-step instructions included
• Advanced corrosion-inhibiting additive package for harsh marine environments
• Mercury Marine part number 8M0188359

Engine & Boat Compatibility

This kit is engineered for:

• Mercury L6 Verado outboards ranging from two-hundred to four-hundred horsepower

Best suited for:

• Offshore fishing boats and center consoles with heavy daily use
• Multi-engine setups relying on consistent lubrication under load
• Family cruisers and pontoons powered by larger Verado engines
• Boaters who prefer OEM-matched maintenance products for peace of mind

Performance & Practical Benefits

The L6 Verado is known for its smoothness, efficiency, and power — but it performs at its best when the oil system is clean and properly maintained. The twenty-five-W forty marine formulation in this kit is blended specifically for engines that face marine stresses: long hours, hot ambient temperatures, high RPM cruising, and constant exposure to moisture and salt.

After completing an oil change with this kit, you’ll notice the way the engine settles into a crisp, even idle. Throttle response feels a touch cleaner. The mid-range pull comes on smoothly, without hesitation. The premium filter captures debris and wear particles before they can circulate, protecting the internal components that keep your outboard running like it should. The drip tray and drain plug seal help make the process cleaner, quicker, and more organized — perfect for anyone who likes to do the job themselves without leaving a mess behind.

It’s one of those maintenance moments where you can feel the difference almost immediately on the water.

Why Buy OEM

High-performance outboards deserve parts that match their engineering. Aftermarket oils may look similar, but they rarely offer the same marine-specific additive packages, viscosity retention, or corrosion resistance Mercury builds into its lubricants. The same goes for filters — a small mismatch in flow rate or bypass pressure can affect long-term performance.

With an OEM kit, everything is guaranteed to fit, function, and protect exactly the way Mercury intended. It saves you guesswork, protects your investment, and keeps your engine running the way you expect when you push off the dock.

FAQ

Q1: Which engines does Oil Change Kit 8M0188359 fit?

It fits Mercury L6 Verado four-stroke outboards from two-hundred to four-hundred horsepower.

Q2: What makes this kit better than using aftermarket oil and filters?

Mercury engineers its oil and filters for marine-specific stresses, ensuring proper lubrication, heat protection, and corrosion resistance.

Q3: How do I confirm this is the right kit for my setup?

Match your Verado model and horsepower rating, or check your owner’s manual for the part number.

Q4: Can the oil be used in both freshwater and saltwater environments?

Yes — the formulation is built to protect against corrosion, humidity, and temperature extremes in any water type.

Q5: Is installation straightforward for most boat owners?

Definitely. With the included drip tray, seal, and instructions, most owners can complete an oil change confidently at home or at the dock.