Mercury – Oil Drain Plug Seal / Washer | Engine Oil Service | 8M0007119

Overview

Changing your oil on a calm morning before heading out is one of those small rituals that keeps an engine healthy and a boater confident. You wipe down the drain plug, feel that familiar resistance as you tighten it, and you want to know—without a doubt—that the seal is doing its job. Mercury Marine part 8M0007119 brings that peace of mind. It is a simple yellow washer, but it carries a big responsibility: keeping your engine oil exactly where it belongs so you can enjoy your time on the water without second-guessing a thing. Whether you are idling through a narrow mangrove cut or running wide open across open water, a reliable seal makes all the difference.

Key Features

• Genuine Mercury Marine oil drain plug seal / washer
• Designed for select 25–60 horsepower Mercury FourStroke outboards
• Yellow seal helps ensure proper seating and easy identification during service
• Durable construction for a tight, dependable oil seal
• Produced to Mercury Marine original equipment specifications
• Intended for use during every oil change for proper maintenance

Engine & Boat Compatibility

• Fits Mercury FourStroke 25–30 horsepower EFI outboards (serial number 0R05170 and above)
• Fits Mercury FourStroke 35–60 horsepower EFI outboards (serial number 1C050252 and above)
• Suitable for a wide range of small fishing boats, jon boats, skiffs, tenders, aluminum runabouts, and compact pontoons
• Designed for engines commonly used in lakes, rivers, coastal flats, and nearshore water

Performance & Practical Benefits

You would not think something as small as a washer could make a noticeable difference, but anyone who has dealt with a slow oil drip knows how frustrating it can be. This seal eliminates that worry. It compresses evenly, holds tight under heat and vibration, and gives you a clean, secure feel when the drain plug is torqued down. You will notice the difference the first time you reinstall the plug—the fit feels right, not loose or uncertain.

In everyday use, the washer helps maintain consistent oil pressure and prevents contaminants from sneaking in at the most critical point of your engine’s lubrication system. If you often fish shallow, run through debris, or trailer your boat long distances, the washer’s stability becomes even more important. It is an easy part to overlook, but replacing it regularly keeps everything clean, tight, and reliable. Even seasoned boaters keep extras in their maintenance kit because once you have had one fail, you never want to risk it again.

Why Buy OEM

A genuine Mercury Marine part gives you the reassurance that the dimensions, material hardness, and sealing properties match your engine exactly. Aftermarket washers may look close, but “close” can still lead to slow leaks, oil loss, or poor compression around the plug. Mercury engineers this washer specifically for the torque spec of their drain plugs, and that exact match matters over the long haul.

You get predictable performance, simple installation, and a seal that holds up in real-world marine conditions. When it comes to something as important as engine oil retention, the smart choice is the one that fits right the first time.

FAQ

Q1: Which Mercury engines does this seal fit?

It fits select 25–60 horsepower FourStroke EFI Mercury outboards. Match your serial number to confirm.

Q2: What makes this different from aftermarket washers?

OEM accuracy. The thickness, compression, and inner diameter are built for Mercury’s drain plug design.

Q3: How do I know if this is the right replacement?

Check your owner’s manual or verify your engine’s serial number range. If it matches the listed ranges, this is the correct washer.

Q4: Can this be used in saltwater and freshwater?

Absolutely. It performs reliably in both environments.

Q5: Is installation straightforward?

Yes. Replace the washer during your oil change, then tighten the plug to the specified torque.