Mercury – 25W-40 4-Stroke Oil Change Kit | L4 Verado Series | Marine-Grade Components | 8M0188358

Overview

There’s something grounding about doing your own engine maintenance — that quiet hour in the driveway or at the dock when you’re taking care of the machine that takes you out into open water. Changing the oil is one of those moments that makes you feel connected to your engine. You’re giving it what it needs to stay strong, smooth, and ready for whatever the day brings. With the Mercury Marine part 8M0188358 Oil Change Kit, you’ll have every component you need, all matched perfectly to the L4 Verado platform. It’s designed to make the process simple, clean, and reassuring, so you can head back out knowing your outboard is protected from the inside out.

Key Features

• Complete oil change kit for Mercury L4 one-hundred-fifty to two-hundred horsepower Verado outboards
• Includes six one-liter bottles of Mercury twenty-five-W forty four-stroke marine engine oil
• Premium Mercury oil filter for reliable marine filtration
• Drain plug seal and step-by-step instructions included
• Engine oil formulated with marine-specific corrosion inhibitors
• Mercury Marine part number 8M0188358

Engine & Boat Compatibility

This OEM kit is built for:

• Mercury L4 Verado four-stroke outboards ranging from one-hundred-fifty to two-hundred horsepower

Ideal for:

• Offshore and nearshore center consoles
• Freshwater fishing boats demanding reliable long-term performance
• Family boats and pontoons powered by mid-range Verado engines
• Owners who want to perform a correct, complete oil change with factory-specified components

Performance & Practical Benefits

A Verado engine thrives when its oil is fresh, clean, and engineered for marine duty. The twenty-five-W forty formulation in this kit holds up under the kind of stress unique to boating — constant load, high heat, hours of running at mid-range, and the harshness of salt or humidity. It maintains its protective film even when you’re running hard, keeping internal components moving smoothly, quietly, and with far less wear.

Using this kit, you’ll notice that the engine idles cleaner, responds faster, and feels steadier at cruising speed. The premium Mercury filter captures fine contaminants that build up over normal operation, helping your engine stay in peak condition. The drain plug seal ensures a tight, leak-free finish, and the included instructions make everything straightforward even if you’re doing the job for the first time. It’s maintenance that feels good — organized, complete, and fully trusted.

Why Buy OEM

Aftermarket oils and filters can look similar on the shelf, but they rarely match the engineering that Mercury builds into its Verado platform. Mercury’s oil carries specific marine additives to guard against corrosion, moisture, foaming, and breakdown under heavy load. Their filters match the exact flow rate and pressure characteristics your outboard needs.

Choosing OEM means you’re not second-guessing anything. The kit fits, works, and lasts exactly as intended, protecting your investment and keeping your engine performing at its best season after season.

FAQ

Q1: Which engines does Oil Change Kit 8M0188358 fit?

It fits Mercury L4 Verado four-stroke outboards from one-hundred-fifty to two-hundred horsepower.

Q2: What makes this kit better than mixing aftermarket components?

Everything inside is engineered specifically for Verado performance, from the oil’s additive package to the filter’s internal construction.

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

Match your horsepower and Verado model, or confirm using the part number in your owner’s manual.

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

Yes — the formulation includes corrosion inhibitors designed for any marine conditions.

Q5: Is an at-home oil change simple with this kit?

Absolutely. The kit includes the correct filter, seal, and instructions, making the process clear and manageable for most boat owners.