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Ignition System
Genuine Mercury Spark Plug - 8M0180173
OEM Mercury Iridium Spark Plug for 500-600hp V12 outboards.
Delivers reliable ignition, improved combustion efficiency, and longer service life.
Compatible Applications
Mercury V12 Outboards. Verify with your engine serial number for exact fitment.
Important Fitment Note
Always confirm compatibility using your engine serial number before ordering.
OEM & Cross Reference Numbers
| OEM | 8M0180173, 8M0178257 |
What This Part Is Used For
This iridium spark plug provides reliable ignition for Mercury V12 outboard engines.
Replacing spark plugs at recommended intervals improves starting, performance, and fuel efficiency.
Key Features and Benefits
- Genuine Mercury OEM quality
- Iridium electrode for longer life and better spark
- Optimized for high-performance V12 engines
- Improves combustion efficiency
FAQ
What engines does this spark plug fit?
Mercury V12 outboards. Verify with serial number.
How often should spark plugs be replaced?
Follow the Mercury service schedule for your specific model (typically every 100-200 hours or annually).
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
Mercury V12 spark plug, 8M0180173, Mercury outboard spark plug, V12 iridium spark plug, 8M0178257
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Searchable Part Numbers
8M0180173 8M0178257
8M0180173
0505123
0509927
0765908
509927
765908
804355
896329885
LKAR7C9
8M0135348
8M0204737
941
8M0204728
8M0058934
889246Q39
889680001