Mercury – Quicksilver 10W-30 4-Stroke Marine Oil, 1 Gallon | Lubrication | 92-8M0078617

Overview

Four-stroke marine engines live a rough life—constant heat, long idle time, sudden throttle changes, and more moisture than any engine really deserves. Clean oil is what keeps them from wearing themselves out. This 10W-30 Quicksilver blend is something a lot of mechanics stick with because it holds steady under load, clings to metal on cold starts, and fights off the corrosion that sneaks into every marine engine sooner or later. It’s the kind of oil you run if you want your motor to stay healthy season after season.

Key Features

 • For All 4-Stroke Marine Engines – Outboards, sterndrives, and inboards.
 • Corrosion-Fighting Formula – Built for salty, humid environments.
 • Strong Viscosity Retention – Stays stable in heat and holds its body during long runs.
 • 10W-30 Viscosity – A weight many marine engines are tuned around.
 • 1-Gallon Jug – Ideal for full oil changes on small and mid-size engines.

Engine & Boat Compatibility

 • 4-stroke outboards
 • 4-stroke sterndrives
 • Inboard 4-stroke engines
 • FC-W and FC-W Catalyst Compatible systems

Performance & Practical Benefits

A fresh fill of this oil usually makes the engine sound smoother and settle into idle quicker. Hard cold starts feel less harsh because the oil actually stays on the components instead of draining off overnight. On long cruises or days spent trolling, the engine stays more relaxed and doesn’t feel like it’s laboring. And because the oil resists thinning and shearing, it hangs onto its protective qualities even when the motor gets hot.

Why Buy OEM

Mercury tests its oils in real engines—not just in a lab—and they build them around the clearances, materials, and heat cycles their motors actually face. Automotive oils just aren’t made for salt air, constant moisture, or long idle periods. With OEM oil, you know the blend is doing exactly what the engine needs.

FAQ

Q1: How often should this oil be changed?
A: Most boaters swap it out every season or after hitting their recommended service hours.

Q2: Can I mix this with other oils?
A: It’s best to stick with one formula to keep performance consistent.

Q3: Is this oil good for saltwater boats?
A: Yes—the corrosion package is designed for harsh marine conditions.

Q4: Does 10W-30 help cold starts?
A: Yes—this viscosity flows well at low temps while still protecting under heat.

Q5: Why not use automotive oil?
A: Marine engines face heat, moisture, and load cycles that car engines never see. Car oil breaks down too quickly.