Mercury 4.6L V8 Verado & SeaPro 300-Hour Service Kit | 8M0149932
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Mercury 4.6L V8 Verado & SeaPro 300-Hour Service Kit – 8M0149932
Part Number: 8M0149932
Brand: Mercury Marine
Official Product Type: 300-Hour Scheduled Maintenance Kit – OEM
System: Full Engine Service – Lubrication, Ignition, Cooling, Drive, Anodes
Serial Requirement: Serial number 2B529482 and higher
About This Kit
This is the genuine Mercury OEM one-box service kit for the complete 300-hour scheduled maintenance on 4.6L V8 Verado and SeaPro outboards. It consolidates all the required replacement parts for a full 300-hour service into a single part number, eliminating the need to source individual components separately. Mercury notes that the 300-hour service includes all elements of the 100-hour service plus additional components specific to the longer interval — this kit is built around that expanded scope.
Note: Mercury 4-stroke engine oil and recommended gear lube are not included in this kit and must be ordered separately.
Compatible Applications
- Mercury 4.6L V8 Verado outboards – serial number 2B529482 and above
- Mercury 4.6L V8 SeaPro outboards – serial number 2B529482 and above
This kit is serial-number-specific. Verify your engine serial number before ordering — a different 300-hour kit applies to earlier 4.6L V8 Verado and SeaPro serial ranges. The serial number is located on the transom bracket plate.
Kit Contents
As specified by Mercury Marine for part number 8M0149932, this kit includes:
- Oil filter
- Fuel filter
- Oil drain seal
- Spark plugs (full set)
- Thermostat assembly
- Serpentine (alternator) belt
- Water pump repair kit
- Anti-vent plate anode
- Additional anodes
- Associated hardware (screws, bolts, washers)
Confirm exact kit contents against the Mercury parts diagram and service manual for your engine serial range before beginning service.
Service Interval
This kit is used at the 300-hour service interval (or as directed by the Mercury owner’s manual for your engine). The 300-hour service is a comprehensive maintenance event that covers all 100-hour service items plus the additional components and systems that require attention at the longer interval. Always follow the Mercury owner’s manual service schedule for your specific engine model and serial range.
What You’ll Need in Addition to This Kit
- Mercury 4-stroke engine oil (sold separately — confirm viscosity grade in your owner’s manual)
- Mercury or Quicksilver recommended gear lube (sold separately)
- Common shop tools as specified in the Mercury service manual
Related Products
- Mercury Quicksilver 300 Hour Service Kit 8M0133617 – for other Mercury engine families
- Mercury 4-Stroke Marine Engine Oil – 25W-40, 4L | 8M0078640
Technical FAQ
Does this kit cover the 100-hour service items as well?
Yes. The 300-hour service includes all elements of the 100-hour service. This kit is designed to cover the full scope of the 300-hour interval, which encompasses the 100-hour items plus the additional components that require replacement at the longer interval.
Is oil included in this kit?
No. Mercury 4-stroke engine oil and gear lube are sold separately. Confirm the correct oil viscosity and quantity for your engine in the owner’s manual before ordering.
How do I confirm this is the right kit for my engine?
Locate your engine serial number on the transom bracket plate and confirm it is 2B529482 or higher. If your serial number is below this break, a different 300-hour kit applies to your engine — contact us to identify the correct part number.
Can I use this kit on a Verado L6?
No. This kit is specific to the 4.6L V8 Verado and SeaPro platform. The L6 Verado uses a different service kit with different components.
Parts Desk Insights
Best use case: This kit is ideal for marine technicians and experienced owner-operators performing the full 300-hour scheduled service on a 4.6L V8 Verado or SeaPro. Buying the kit is almost always more economical than sourcing the oil filter, fuel filter, spark plugs, thermostat, belt, water pump kit, and anodes individually — and it ensures every component is the correct OEM spec for the engine.
Common mistakes: The most frequent error is ordering this kit without confirming the serial number break — the 4.6L V8 Verado platform spans multiple serial ranges, each with its own service kit. Also watch for customers who assume oil and gear lube are included; they are not, and forgetting to order them means the service can’t be completed in one visit. A second common mistake is confusing this with the 100-hour kit — the 300-hour kit contains additional components (thermostat, belt, water pump kit, anodes) that are not in the 100-hour service.
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.