Mercury MerCruiser Quicksilver Oil Sump Plug O-Ring 8M0036228
In stock items ship same or next day.
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Product Description
Mercury Quicksilver 25-8M0036228 is the small O-ring used in specified FourStroke oil-sump plug assemblies. The catalog identifies its size as 8.1 x 1.6 and lists it separately from the larger O-rings in the same oil-plug arrangement.
Key Features
- OEM number: 25-8M0036228.
- Catalog size designation: 8.1 x 1.6.
- Current replacement: 25-8M0188343.
Compatibility and Fitment
A verified application is Mercury 75 EFI FourStroke, serial number 2B095049 and up, oil-sump diagram position 8. Other 75–115 and 150 FourStroke assemblies also use this number; match the exact oil-plug design.
Replacement and Installation
Replace a cut, flattened or damaged ring during oil-plug service. Clean its groove and follow the engine procedure for lubrication and plug installation; inspect for leakage after service.
Alternate / Superseded Part Numbers
25-8M0036228 is superseded by 25-8M0188343.
Mercury Parts Finder
Search Mercury parts by serial number or part number.
Parts Desk Insight
Three different O-ring numbers can appear together in the oil-sump plug diagram. Match the small ring to its own callout rather than substituting the larger plug seals.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.