Mercury – Quicksilver 10W-30 4-Stroke Synthetic Marine Engine Oil | Marine Lubrication | Synthetic Blend | 8M0142135

Overview

Every boater knows that peace of mind comes from the little things—like the quiet confidence you feel when you check your oil before heading out and know your engine is protected. Good oil does more than keep parts moving; it keeps your day on track, whether you are pushing across open water or easing into your favorite cove. Quicksilver 10W-30 Synthetic Marine Engine Oil 8M0142135 delivers that steady reassurance. It is the kind of oil you trust when the weather turns, the chop picks up, and you need your engine to respond without hesitation.

Key Features

• Designed for all four-stroke marine outboards, as well as inboard and sterndrive engines
• Synthetic blend formulation provides strong protection against wear and corrosion
• Excellent shear stability and viscosity retention under heavy marine loads
• Meets or exceeds all major marine engine manufacturer requirements
• SAE 10W-30 viscosity for broad temperature performance
• One-quart bottle; Mercury Marine part number 8M0142135

Engine & Boat Compatibility

• Ideal for four-stroke outboards up to 150 horsepower
• Approved for Mercury 3.4L V6 and 4.6L V8 outboards
• Suitable for most sterndrives and inboard setups
• Commonly used on center consoles, pontoons, runabouts, freshwater fishing boats, and light offshore vessels

Performance & Practical Benefits

Running a marine engine is nothing like running a car, and this oil behaves the way a marine engine needs it to. It holds its viscosity in pounding chop, high heat, and long idle stretches. You will feel the difference in smoother acceleration, steady mid-range power, and quieter operation at low speeds. The corrosion protection is especially noticeable—saltwater, humidity, and sitting at the dock can do real damage, but this blend keeps internal components cleaner and better shielded.

What stands out most is how predictable it feels. Oil pressure stays tight and stable. The engine runs cool and controlled. You will not hear that stressed, strained tone that comes from oil breaking down under load. Instead, everything feels secure and ready for whatever the day brings.

Why Buy OEM

When you buy OEM marine oil, you are not paying for a label—you are paying for certainty. Mercury designs its lubricants specifically for the way marine engines operate: high revs, constant load, long hours, and harsh environments. Aftermarket oils may meet a basic rating, but they rarely match the marine-specific additives, corrosion inhibitors, and stability you get here.

If you want your engine to last longer, perform better, and require fewer surprises at service time, OEM oil is simply the smarter choice. It is cost-effective protection with none of the guesswork.

FAQ

Q1: Which engines does Quicksilver 10W-30 Oil 8M0142135 fit?

It is recommended for all four-stroke Mercury outboards up to 150 horsepower, as well as the 3.4L V6 and 4.6L V8 platforms, plus most inboard and sterndrive engines.

Q2: What makes this different from an automotive oil?

Marine oil handles moisture, constant load, and high RPM better. This blend is engineered specifically for those demands.

Q3: How can I confirm this is the right oil for my outboard?

Check your owner’s manual for the recommended viscosity. If it calls for 10W-30 marine oil, this is the correct choice.

Q4: Is this oil suitable for saltwater and freshwater engines?

Yes. It provides corrosion protection for both environments.

Q5: Is it simple to switch to this oil?

Absolutely. If your engine calls for 10W-30 four-stroke oil, you can use it during your next oil change with no complications.