Description
Mercury 8M0188221 Engine Oil Drain Plug Seal
Mercury 8M0188221 is a genuine engine oil drain plug seal for select Mercury and Mariner 20-60 HP FourStroke outboards where this part number is specified. This is an engine oil drain plug seal, not a lower-unit gearcase drain screw washer.
Key Features
- Genuine Mercury replacement engine oil drain plug seal
- Used at the engine oil drain plug on specified FourStroke outboards
- Helps provide a proper seal after engine oil drain service
- Recommended replacement item during routine oil changes when specified
Fitment / Product Details
- Brand: Mercury
- Part Number: 8M0188221
- BU Part ID: 8M0188221
- Product Type: Engine Oil Drain Plug Seal
- Application: Select Mercury and Mariner 20-60 HP FourStroke outboards where specified
- Engine Style: Outboard
- HP Range: 20-60 HP
- Supersedes 8M0007119
- Package Quantity: Each
- Fitment Note: Confirm compatibility by part number, model, horsepower, serial number/model year, parts diagram, owner’s manual, or service manual before ordering.
Expanded Fitment
- Select Mercury and Mariner 20-60 HP FourStroke outboards where engine oil drain plug seal 8M0188221 is specified.
What’s Included
- One Mercury 8M0188221 engine oil drain plug seal
What This Seal Is Not
- This is not the lower-unit gearcase drain/fill screw washer.
- For gearcase/lower-unit drain screw service, confirm the correct gearcase washer part number separately by serial number or parts diagram.
Why You Should Buy
- Correct genuine Mercury service part for applications that specify 8M0188221
- Helps prevent reusing a worn or compressed engine oil drain plug seal
- Small but important service item for clean, reliable oil-change maintenance
Common Applications
- Engine oil changes on specified 20-60 HP Mercury and Mariner FourStroke outboards
- Replacing a compressed, worn, or missing engine oil drain plug seal
- Service-department stock for routine Mercury FourStroke oil service
FAQ
- Is this for the lower unit? No. This listing is for the engine oil drain plug seal, not the lower-unit gearcase drain screw washer.
- Does this fit every 20-60 HP Mercury outboard? No. Use it only where part number 8M0188221 is specified for your engine.
- Should this be replaced during an oil change? Replace it when your Mercury service information calls for it or when the existing seal is worn, damaged, or compressed.
- How do I confirm fitment? Match part number 8M0188221 to your Mercury or Mariner parts diagram, serial number, owner’s manual, or service manual before ordering.