Mercury – Quicksilver 5W-40 Full Synthetic 4-Stroke ATV Engine Oil | ATV/UTV Oil | Full Synthetic | 8M0058914

Overview

There’s something reassuring about pouring in an oil you know will hold up, no matter how hard you push your machine. Whether you’re picking your way through quiet trails or working a utility vehicle all afternoon, you want the engine to feel steady, responsive, and ready for whatever comes next. Quicksilver 5W-40 Full Synthetic 4-Stroke ATV Engine Oil brings that kind of trust. It keeps everything inside the engine moving freely — not just on the easy days, but on the ones that test your equipment and your patience.

Key Features

• Full synthetic 5W-40 formula built for four-stroke ATV and UTV engines
• Excellent film strength that resists shear, heat, and oxidation
• Additive package protects against corrosion and internal wear
• Designed for easy starting and smooth cold-flow performance in low temperatures
• Optimizes clutch performance, even in wet clutch systems
• Meets or exceeds major powersports manufacturer warranty requirements
• One-quart bottle
• Mercury Marine part number 8M0058914

Engine & Boat Compatibility

• Ideal for modern four-stroke ATV and UTV engines, including fuel-injected and turbocharged models
• Works well in sport, touring, utility, and work-focused machines
• Suitable for riders who operate in mixed conditions: mud, dust, snow, and temperature swings
• Compatible with wet clutch systems that require stable oil performance

Performance & Practical Benefits

What stands out with this oil is how your engine feels once it’s warmed up — steady, confident, and well-protected. The synthetic formula holds its strength even under high heat, so you’re not worrying about the oil thinning out during long climbs or heavy towing. Everything inside the engine stays cushioned by a strong, protective film, which helps components last longer and perform with more consistency.

Cold days tell the other half of the story. You’ll notice how willingly the engine turns over, even when the temperature drops and the air feels sharp. The oil flows fast, protects instantly, and keeps start-ups smooth instead of strained. And because this formula helps the clutch operate cleanly and predictably, you get solid engagement without that slipping or dragging feeling that lower-grade oils sometimes cause.

In real use, you feel the difference in the way the machine responds — the throttle comes alive, gear changes stay crisp, and the engine runs with a smooth hum rather than a tired rattle. It’s the type of reliability that makes long days easier and tough terrain a little less unforgiving.

Why Buy OEM

Choosing a genuine Mercury Marine part means choosing something engineered with long-term performance in mind. This isn’t a one-size-fits-all blend. It’s built to handle real powersports conditions — high heat, sudden load changes, cold mornings, and heavy clutch use. Aftermarket oils might look similar on paper, but they rarely offer the same level of testing or the same confidence. With OEM oil, you’re protecting your investment and ensuring the engine performs the way the manufacturer intended. It’s practical, cost-effective, and the smarter choice for anyone who depends on their machine.

FAQ

Q1: Which Mercury engines or systems does this oil fit?

This oil is made for four-stroke ATV and UTV engines, including modern fuel-injected and turbocharged designs.

Q2: What makes it different from aftermarket options?

It delivers stronger film protection, better clutch performance, and reliable heat stability backed by Mercury’s engineering standards.

Q3: How do I know if this is the correct oil for my machine?

If your manufacturer recommends a full synthetic 5W-40 oil or you operate in demanding conditions, this is a safe and dependable match.

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

It’s designed for land-based powersports use, but it holds up well in damp, coastal, or harsh outdoor conditions.

Q5: Is installation straightforward for most owners?

Yes — drain the old oil, replace the filter if needed, and fill to the recommended level. Nothing complicated.