Mercury – Quicksilver 10W-40 4-Stroke Marine Engine Oil | Mineral Base Protection | Premium Marine Lubrication | 8M0148476

Overview

When you spend your weekends on the water, you learn quickly that a reliable engine is more than machinery — it’s your ticket to quiet coves, early morning fishing runs and long afternoons with the family. That reliability starts with the oil you trust. The Mercury Marine part number 8M0148476, Quicksilver 10W-40 4-Stroke Marine Engine Oil, gives your motor the steady, protective foundation it needs. It’s the kind of oil that makes you feel confident when you idle out of the marina or push the throttle toward open water, knowing everything inside your engine is protected and working together smoothly.

Key Features

• Mineral base 4-stroke engine oil formulated for marine outboards, sterndrives, inboards and personal watercraft
• SAE 10W-40 viscosity for dependable performance in warm to moderate climates
• Enhanced marine additive package to guard against corrosion and wear
• Designed to withstand high-rpm operation and heat stress unique to marine engines
• Meets or exceeds FC-W and FC-W Catalyst Compatible requirements
• One-quart bottle for easy pouring and clean storage

Engine & Boat Compatibility

• Compatible with all 4-stroke Mercury and Quicksilver outboards
• Works with most sterndrive and inboard engines requiring 10W-40 FC-W oil
• Suitable for fishing boats, pontoons, bay boats, ski and towboats, cruisers and personal watercraft
• Trusted across multiple brands within the marine industry requiring FC-W specification oil

Performance & Practical Benefits

Marine engines don’t get the easy life that automotive engines do. They face constant moisture, higher loads and longer periods of sustained rpm. This Quicksilver formula is built for exactly those conditions. Its mineral base stays stable, keeping the viscosity consistent so your engine maintains the smooth, protective oil film it needs — even when you run hard on a hot summer day.

From the first start of the morning, you’ll feel how smoothly your engine settles into idle. Accelerating onto plane feels solid and controlled, without the roughness that can show up when oil breaks down. At higher rpm, the oil continues to protect against heat and friction, keeping everything tight and secure inside the engine. The advanced additive package helps prevent varnish buildup and sludge, so your engine internals stay cleaner for longer. That means more dependable seasons on the water and fewer unexpected repairs.

One of the greatest advantages is corrosion resistance. Marine engines live in moisture — even freshwater boats deal with humidity, condensation and temperature swings. This oil helps defend internal metal surfaces against rust, extending the life of critical components and keeping your engine feeling strong year after year.

Why Buy OEM

There’s a simple reason why experienced boaters stick with Quicksilver: it’s made for the marine world. Automotive oils aren’t designed for marine demands, and aftermarket blends rarely meet the same quality standards. Quicksilver oils go through rigorous testing that mirrors real boating conditions, and they meet every manufacturer’s warranty requirement. If someone at the dock asked which oil to trust, you’d probably say the same thing — use the oil built by the company that built the engine. It lasts longer, performs better and keeps your maintenance simple.

FAQ

Q1: Which engines does the 8M0148476 oil fit?

It works in all 4-stroke outboard, sterndrive and inboard engines that require FC-W 10W-40 marine oil.

Q2: How is this different from automotive oil?

It’s formulated for moisture-rich, high-load marine environments where automotive oil would break down or fail to protect adequately.

Q3: How do I confirm this is the right oil?

Check your owner’s manual. If it specifies FC-W or FC-W Catalyst Compatible 10W-40, this is the correct match.

Q4: Can it handle both freshwater and saltwater conditions?

Yes — its additives deliver strong corrosion resistance regardless of the water you run in.

Q5: Is the one-quart size convenient for most boat owners?

Absolutely. It’s easy to store, pour and carry aboard for routine maintenance or emergency top-offs.