Mercury – Full Synthetic 4-Stroke ATV/UTV Engine Oil | 5W-50 | 8M0149407

Overview

If you spend enough time riding backcountry trails or working long days on the ranch, you learn to appreciate the small things that keep your machine running strong. Good oil is one of them. There’s a certain confidence that comes from knowing your engine will fire up without hesitation on a cold morning, or carry you through a long, dusty climb without stumbling. That’s the reliability riders look for, and it’s exactly what this Mercury Marine part delivers. The 5W-50 Full Synthetic Oil, part number 8M0149407, is the kind of oil you trust because it simply does its job—quietly, consistently, and without compromise.

Key Features

• Full synthetic formulation designed for ATV, UTV and motorcycle engines
• Provides strong protection against wear, heat and corrosion
• Maintains viscosity across wide temperature swings
• Minimizes performance-robbing deposits inside the engine
• Meets or exceeds major off-road manufacturer requirements
• Ideal for cold-weather starting and year-round dependability
• Packaged in a one-quart bottle

Engine & Vehicle Compatibility

• Suitable for most four-stroke ATV, UTV and motorcycle engines
• Recommended for machines used in varied terrain: trails, farms, ranches and work sites
• Compatible with all major original equipment brands
• Works well in both recreational and utility-focused vehicles

Performance & Practical Benefits

Running this full synthetic 5W-50 feels a bit like giving your machine a deep breath of fresh air. The engine settles into a smoother rhythm, throttle response feels more immediate and the whole powertrain just feels tighter and more controlled. The oil’s wide viscosity range means you’ll get steady protection whether you’re starting up before sunrise in cold weather or pushing hard through a long, hot afternoon.

The synthetic blend resists breakdown under heat, which helps prevent the sludge and varnish that can slowly eat away at performance. Riders also appreciate how clean the engine stays over time—fewer deposits mean more consistent power and fewer surprises. And because it flows easily in cold temperatures, you won’t find yourself waiting around for the engine to warm up before it’s ready to work.

Why Buy OEM

Choosing an OEM-specified oil isn’t about brand loyalty—it’s about knowing your engine is protected the way the manufacturer intended. Mercury Marine parts are engineered to meet strict reliability standards, and this oil is no exception. It’s cost-effective in the long run because it cuts down on wear, reduces maintenance headaches and promotes longer engine life. When you pour this oil into your machine, you’re using a product designed to perform right the first time. It’s advice most riders would give a friend: stick with the real thing, and your engine will thank you.

FAQ

Q1: Which Mercury engines or systems does the 5W-50 Full Synthetic Oil fit?

It’s designed for a broad range of four-stroke ATV, UTV and motorcycle engines, making it suitable for most major off-road brands.

Q2: What makes this different from aftermarket oils?

This oil meets strict OEM protection standards, offering better long-term wear resistance and more stable viscosity in extreme temperatures.

Q3: How do I confirm it’s the right oil for my machine?

Check your owner’s manual for viscosity recommendations. If your manual lists 5W-50, this oil is a safe, high-quality match.

Q4: Can I use it in both hot and cold environments?

Yes. Its synthetic formula flows well in cold starts and holds strong in high-heat, high-load riding conditions.

Q5: Is installation straightforward?

Absolutely. Just drain, replace the filter if needed and refill with the recommended amount. No special tools required.