Mercury – Magnesium Anode Plate | V6, V8 & V10 Series | Magnesium Anti-Corrosion Plate | 8M0200103

Overview

If you’ve spent any time on the water, you know how much trust we put in our engines. Whether you’re running wide across a glassy lake at dawn or easing the boat back onto the trailer at sunset, you want the reassurance that every part of your motor is protected. Corrosion is one of those quiet threats — it doesn’t show up all at once, but over time it can eat away at performance and reliability. That’s why a good anode matters. With this genuine Mercury Marine part, you get the peace of mind that your engine is shielded where it counts, giving you the confidence to enjoy more days on the water without worry.

Key Features

• Magnesium anode plate designed to protect your engine from galvanic corrosion
• Intended for freshwater applications where magnesium offers superior protection
• Precision-engineered to Mercury’s OEM specifications for V6, V8, and V10 outboards
• Mercury Marine part number 8M0200103
• Replacement anode only (fastener sold separately)
• Long-lasting material designed to erode predictably and safeguard critical components

Engine & Boat Compatibility

Compatible with the following Mercury and Mercury Racing engines:

• One-hundred-seventy-five to two-hundred-twenty-five horsepower Three-point-four-liter V6 and ProXS (2B529482 and up)
• Two-hundred to three-hundred horsepower Four-point-six-liter V8 and ProXS, including SeaPro (2B529482 and up)
• Three-hundred horsepower Four-point-six-liter V8 Verado (2B529482 and up)
• Mercury Racing one-hundred-fifty-R Three-point-four-liter V6 (3B547096 and up)
• Three-hundred-R (1E080500 and up)
• Four-hundred-R Five-point-seven-liter V10 (3B272954 and up)
• Four-hundred-fifty-R (1E083006 to 1E099720)
• Five-hundred-R Four-point-six-liter V8 (1E099432 and up)
• Three-hundred-fifty to four-hundred-twenty-five horsepower Five-point-seven-liter V10 Verado (3B266064 and up)
• Ideal for freshwater fishing boats, high-performance rigs, pontoons, bass boats, and luxury recreational setups that demand reliable corrosion control.

Performance & Practical Benefits

Corrosion protection is one of those behind-the-scenes essentials that keeps your engine alive and performing the way Mercury intended. This magnesium anode is designed to sacrifice itself slowly over time, protecting your outboard’s expensive internal metals from galvanic corrosion. You’ll notice improved longevity in your lower unit and mounting hardware, steadier performance year after year, and fewer surprises during routine maintenance.

Once installed, the anode sits tight and secure with a clean, solid feel. It wears evenly and predictably, giving you visual confirmation of its effectiveness. That smooth, steady erosion pattern is what you want — it means the anode is doing its job and your engine’s important components are staying protected. Freshwater boaters especially rely on magnesium, as it offers the strongest protection in low-mineral environments where aluminum or zinc aren’t nearly as effective.

Why Buy OEM

With corrosion protection, shortcuts aren’t worth the risk. Aftermarket anodes may use inconsistent materials, incorrect alloy mixtures, or poor machining that prevents proper electrical contact. When that happens, corrosion attacks the parts you’re trying to protect — and those repairs aren’t cheap.

A genuine Mercury Marine part ensures you’re getting the exact magnesium alloy, fitment, and performance your engine was engineered for. It’s designed to wear at the correct rate, deliver reliable protection, and integrate perfectly with your Mercury powerhead and lower unit. It’s the kind of practical decision experienced boaters make: trust the brand that built the engine to protect it.

FAQ

Q1: Which engines does the Magnesium Anode Plate 8M0200103 fit?

It fits select Mercury and Mercury Racing V6, V8, and V10 outboards within the horsepower and serial ranges listed above.

Q2: Why choose a magnesium anode over aluminum or zinc?

Magnesium offers superior protection in freshwater, where other anode materials may underperform.

Q3: How do I confirm this is the correct anode for my setup?

Check your engine’s horsepower, serial range, and manual. If it matches the listed compatibility, you're set.

Q4: Is this anode suitable for saltwater or brackish water?

No — magnesium is intended exclusively for freshwater; aluminum is recommended for salt and brackish environments.

Q5: Is installation straightforward?

Yes. Remove the old anode, position the new one, and secure it with the appropriate fastener (sold separately).