Mercury – Spark Plug Set | V12 Verado & SeaPro Series | Precision-Engineered Metal Core | 8M0180173

Overview

When you run a Mercury V12, you’re counting on an engine that answers instantly whether you’re easing out of the marina at sunrise or pushing hard through a rolling offshore swell. There’s a quiet confidence that comes from knowing every ignition cycle fires clean, steady, and strong. These Mercury Marine spark plugs deliver that feeling. They bring a sense of trust you can literally feel under your feet, the kind that lets you focus on the horizon instead of worrying about hesitation, rough idle, or lost power.

Key Features

• Designed to deliver consistent ignition in high-output Mercury Marine V12 engines
• Precision-built NGK-ILKAR7G-9 spark plugs included (set of four)
• Engineered metal core for clean, reliable combustion
• Optimized for smooth idle, crisp throttle response, and sustained high-rpm performance
• Manufactured to Mercury Marine’s strict OEM standards for fit and durability
• Replacement for NGK-LKAR7G-9 plugs

Engine & Boat Compatibility

• Fits Mercury 7.6-liter V12 Verado outboards, 600 horsepower
• Compatible with Mercury 7.6-liter V12 SeaPro commercial series outboards, 500 horsepower
• Designed for engines with serial numbers 3B060051 and above
• Ideal for offshore center consoles, heavy commercial hulls, cruisers, and performance fishing boats
• Built for both recreational and demanding commercial applications

Performance & Practical Benefits

On a big-power outboard like the Mercury V12, spark energy isn’t just a technical detail—it’s the heartbeat of the whole experience. With these plugs installed, the engine lights off quickly, idles with a confident steadiness, and climbs through the powerband without hesitation. You’ll notice how smooth the throttle feels, how cleanly it holds plane, and how secure the engine sounds when conditions get rough.

These plugs are built to handle extreme combustion pressures and long hours of operation. Their refined construction helps resist fouling, supports better fuel economy, and keeps the ignition cycle tight and predictable. Whether you’re running long-distance offshore trips or shuttling guests all season, you’ll feel the dependable consistency that only true OEM components provide.

Why Buy OEM

When it comes to ignition components—especially for a powerhouse like the Mercury V12—it’s simply not worth cutting corners. Aftermarket plugs might fit, but they rarely match the exact heat range, electrode design, and long-term durability required for this platform. OEM plugs ensure proper combustion, correct load handling, and reduced long-term maintenance hassles.

Choosing this Mercury Marine part means you’re giving your engine what it was engineered to run with. It’s a smart, practical decision that pays off in smoother operation, fewer surprises, and a longer service life. When another boater asks what you’re running, you’ll have the confidence of knowing you chose the plug set designed specifically for your engine.

FAQ

Q1: Which engines does the Mercury Spark Plug Set 8M0180173 fit?

It fits Mercury 7.6-liter V12 outboards, including the 600 horsepower Verado and 500 horsepower SeaPro models.

Q2: What makes these plugs different from aftermarket options?

They match Mercury’s exact ignition requirements, helping maintain smooth idle, full power delivery, and long-term durability.

Q3: How do I know if this is the correct replacement set for my engine?

Check your serial number—these plugs fit engines numbered 3B060051 and above.

Q4: Can these spark plugs be used in both saltwater and freshwater applications?

Yes. They’re engineered for the full range of marine environments.

Q5: Is installation straightforward?

Most boat owners can install them with common tools, but always check and set gap per your owner’s manual or cowling decal.