Mercury – 4-Stroke Engine Oil Filter | Filtration System | Corrosion-Resistant Housing | 877761K01

Overview

Reliable oil flow is the heart of a healthy outboard, and the Mercury 877761K01 Oil Filter makes sure your four-stroke gets exactly the protection it needs. When you're running long distances, trolling all afternoon, or navigating tight channels at idle, it’s the oil system that keeps everything cool, smooth, and predictable. This filter gives boaters a sense of calm — the kind that comes from knowing their engine is being cared for each second it’s running. It’s one of those small parts that quietly supports every great day on the water.

Key Features

• Screw-on oil filter designed for Mercury FourStroke engines
• Superior M-Pleated filtration media removes fine contaminants
• Heavy-duty housing with corrosion-resistant coating
• Maintains steady oil pressure for cleaner operation
• OEM filter engineered for long-term reliability

Engine & Boat Compatibility

• Fits Mercury FourStroke:
  • 75–115 horsepower outboards
  • 150 horsepower EFI FourStroke outboards
  • 105 horsepower EFI Jet models
• Ideal for runabouts, pontoons, bay boats, bass boats, and multi-species hulls

Performance & Practical Benefits

This filter keeps your oil clean and your engine running strong. The M-Pleated media captures fine debris that can slip past cheaper filters, giving you more consistent lubrication and smoother operation across the entire power range. Start-ups feel cleaner, and longer runs stay more predictable because the oil isn’t fighting through contamination.

The strong metal housing resists corrosion and temperature swings, which is essential in a marine engine that spends its life dealing with heat, humidity, and vibration. Installation is simple — a quick spin-off, spin-on replacement most boaters can do at home.

Why Buy OEM

Oil filtration is one of the most important maintenance items on a four-stroke. Aftermarket filters often use thinner housings, lower-grade paper, or inconsistent bypass valves. Mercury’s OEM filter is engineered specifically for its FourStroke engines — correct pressure, correct flow rate, correct filtration.

If you want your engine to last, OEM is the only smart choice.

FAQ

Q1: Which engines does this filter fit?

Mercury 75–115 horsepower FourStroke outboards, the 150 EFI FourStroke, and corresponding jet models.

Q2: Why choose OEM?

The filtration media, bypass valve, and housing strength are built to Mercury’s exact engineering standards.

Q3: How do I confirm this is the right filter?

Match your serial number or check your owner’s manual.

Q4: Can it be used in saltwater?

Yes — the housing and materials are corrosion-resistant.

Q5: Is installation difficult?

No. Most boaters replace it easily with a basic oil-filter wrench.