Mercury – Quicksilver 4-Stroke 25W-40 Synthetic Blend Marine Oil (Quart, 6-Pack) | Engine Lubrication | 92-8M0078622

Overview

This oil is the blend most techs reach for when they want something steady and predictable in a 4-stroke outboard. It holds its weight well through long idle stretches, warm runs, and the stop-and-go rhythm a lot of boaters put their engines through. Pouring it in, you can feel it has the right body for marine use—not too thin, not sluggish. It’s a straightforward choice that keeps the engine running comfortably across a full day on the water.

Key Features

  • Synthetic Blend Formula – Offers consistent protection under heat and load.
  • 25W-40 Marine Weight – Suited for the temperature swings common in 4-stroke outboards.
  • Corrosion-Resistant Additives – Helps protect internal parts in humid and salt-heavy environments.
  • Clean-Burning Blend – Reduces deposits that can build up over longer service intervals.

Engine & Boat Compatibility

  • Mercury 4-Stroke engines
  • EFI and carbureted platforms
  • Mid-range FourStroke series
  • Quicksilver marine lubrication line

Performance & Practical Benefits

Engines usually idle a little smoother once this oil is circulating, especially if the old oil was overdue. It settles into a steady rhythm during long runs and doesn’t thin out when the engine warms up. Throttle response tends to feel more consistent, which is noticeable on boats that see a mix of slow cruising and higher RPM work. Overall, the engine feels more settled throughout the day.

Why Buy OEM

Quicksilver blends this oil around Mercury’s tolerances, so pressure and flow behave the way the engines expect. That keeps sensor readings stable and avoids the small quirks that show up with automotive oils. Using OEM oil keeps the engine’s behavior predictable from one service interval to the next.

FAQ

1. How do I know when the oil needs changing?
Dark, thin oil on the dipstick or a season of use is usually a sign it’s time.

2. Do I need anything special to run this oil?
No—just follow Mercury’s normal oil-change steps.

3. Is this blend fine for saltwater use?
Yes, it includes corrosion protection for marine environments.

4. Will the engine sound different with fresh oil?
Many boaters notice a steadier idle and cleaner warm-up.

5. What happens if I stretch oil changes too long?
Engines may run warmer, idle rougher, and feel less responsive under load.