Mercury – Oil Filter | High-Efficiency Filtration | Marine Coated Steel | 866340Q03

Overview

There’s a quiet satisfaction in knowing your engine is protected by the right parts. When you use a filter that’s built specifically for marine conditions, you can feel the difference in every start-up and every long run. The Quicksilver 866340Q03 oil filter gives your engine the clean, steady lubrication it depends on, and it does it without fanfare — just dependable, day-in, day-out performance. If you’re the kind of boater who values doing things right the first time, this filter fits that mindset perfectly.

Key Features

• High-capacity M-Pleated media removes contaminants.
• Anti-drainback valve ensures proper lubrication at startup.
• Thick, corrosion-resistant metal shell.
• Designed for tight, leak-free sealing.
• Meets Mercury Marine OEM standards.

Engine & Boat Compatibility

• Fits most MerCruiser high-performance sterndrive and inboard engines.
• Designed for GM-based engines and Mercury 4.5L / 6.2L platforms.
• Works in freshwater and saltwater conditions.
• Suitable for performance boats, cruisers, and multi-purpose runabouts.

Performance & Practical Benefits

This filter provides cleaner oil circulation, which leads to smoother operation and longer engine life. You’ll feel the effect most when starting the engine after it sits — the anti-drainback valve ensures oil is already in the right places, preventing dry starts and noisy warmups. Over long days on the water, the filtration media holds up under heat and pressure, keeping wear-causing particles suspended and out of your engine internals.

Because the shell is noticeably thicker than generic filters, it resists deformation and the corrosion that often comes with marine humidity. The fitment is exact, which means no cross-threading, no leaks, and a proper seal every time.

Why Buy OEM

Quicksilver filters are built to handle marine stress — high moisture levels, long run times, heavy loads, and constant heat cycling. Aftermarket filters might fit, but they often lack the media capacity, the shell strength, and the moisture-handling design needed for real boating conditions. When you choose OEM, you’re buying reliability you can feel.

FAQ

Q1: What engines does this filter fit?

Most MerCruiser sterndrive and inboard engines except V6 block-mounted types.

Q2: Why choose this over a regular automotive filter?

Marine engines face harsher conditions — this filter is built specifically for them.

Q3: How do I verify fitment?

Match your engine model and confirm your oil filter mount location.

Q4: Is it saltwater-safe?

Absolutely — the coating and materials resist marine corrosion.

Q5: Is installation simple?

Yes, with standard access and a filter wrench.