Mercury – Oil Pump Assembly | OptiMax & Diesel Series | Marine-Grade Construction | 8M0185614

Overview

Every boater knows there’s a certain peace that comes when your engine runs the way it’s supposed to — smooth, steady, and trustworthy. That’s the kind of confidence this Mercury Marine part gives you. An oil pump may not be something you show off, but you sure feel its importance when you’re running far from the dock. With this assembly in place, you know your outboard is getting the oil flow it needs, no matter if you’re idling through a quiet channel or pushing hard across open water.

Key Features

• Maintains consistent oil flow for select Mercury TwoStroke and Diesel outboards
• Engineered for durability in heavy-duty marine environments
• Marine-grade construction designed for long-term reliability
• Built to precise Mercury Marine part number 8M0185614 standards
• Designed and tested to support clean lubrication under varying load and temperature conditions

Engine & Boat Compatibility

• Fits Mercury three-liter DSI Diesel engines (serial 1E052967 and up)
• Compatible with Mercury 200 DFI Jet Drive (0M954922 and up)
• Fits one-point-five-liter OptiMax seventy-five to one hundred twenty-five horsepower outboards
• Supports two-point-five-liter Pro XS OptiMax one hundred ten to one hundred seventy-five horsepower models
• Also fits two-point-five-liter OptiMax two hundred to two hundred twenty-five horsepower outboards
• Works with three-liter Pro XS and XS OptiMax two hundred to three hundred horsepower engines
• Fits three-liter 300X Pro Max engines
• Common on performance fishing boats, bass boats, offshore rigs, center consoles, and high-output recreational setups

Performance & Practical Benefits

A reliable oil pump changes the entire character of your outboard. You’ll notice how smoothly the engine runs, how steady it feels at different throttle points, and how confidently it holds power under load. The pump keeps lubrication flowing even when conditions shift — rough water, sudden acceleration, or long stretches of steady cruising. Everything inside the engine stays cooler, quieter, and protected, which helps extend the life of the powerhead.

Because the assembly is built to Mercury’s standards, installation feels familiar and predictable. The fit is tight without being fussy, and once it’s seated, you can trust it to do its job without constant worry. Over time, you’ll appreciate the reduced wear, smoother operation, and the sense of control that comes from knowing your engine is being fed properly every mile you travel.

Why Buy OEM

Any seasoned boater will tell you: the lubrication system isn’t a place to gamble on aftermarket shortcuts. A genuine Mercury Marine part ensures your oil pump is built to handle the exact demands of your engine. With OEM, you get materials that last, performance that stays consistent, and engineering that matches every channel and passage inside your outboard.

Aftermarket pumps can look appealing up front but often fall short in long-term reliability or internal tolerances — and a mismatch in something this important can cost you much more down the line. Using the correct part number protects your engine, your time, and the experiences you rely on out on the water.

FAQ

Q1: Which Mercury engines does the Oil Pump Assembly 8M0185614 fit?

It fits a range of OptiMax, Pro XS, Pro Max, DFI Jet Drive, and Diesel outboards from seventy-five to three hundred horsepower.

Q2: What makes this Mercury Marine part different from aftermarket pumps?

It’s engineered to match Mercury’s exact lubrication requirements, ensuring steady oil flow and long-term reliability.

Q3: How can I confirm it’s the right replacement?

Match your part number or check your outboard’s serial range — if it falls within the listed compatibility, you’re in good shape.

Q4: Is it suitable for both saltwater and freshwater use?

Yes. Its materials are tested for harsh marine environments and perform well in both conditions.

Q5: Is installation straightforward?

Boat owners familiar with Mercury outboards usually find the fit clean and natural, thanks to the precise OEM design.