Mercury Quicksilver 300-Hour Service Kit 8M0149930 — 3.4L V6 FourStroke Outboard
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Mercury Quicksilver 300-Hour Service Kit — OEM 8M0149930 | 3.4L V6 FourStroke
Stay on schedule with your Mercury 3.4L V6 FourStroke 300-hour service using this genuine OEM kit. Mercury has packaged all the major scheduled-replacement components together — filters, spark plugs, thermostat, alternator belt, water pump parts, drain seals, and anodes — so everything arrives in one box, matched to the correct spec for the V6 engine. Engine oil and gear lube are sold separately.
Part Information
- OEM Part Number: 8M0149930
- Brand: Mercury / Quicksilver
- Official Product Type: 300-hour maintenance service kit
- Engine: Mercury 3.4L V6 FourStroke outboard
- Serial Range: 2B529482 and up (for listed V6 configurations)
- GTIN / UPC: 745061250079
- Note: Engine oil and gear lubricant are not included — sold separately
Kit Contents
- Oil filter
- Fuel filter (high- and low-pressure fuel filter service components)
- 2 oil drain seals
- 6 spark plugs (V6 quantity)
- Thermostat
- Alternator belt
- Water pump repair kit (impeller, housing, gaskets, wear plate, hardware)
- Anodes
Compatible Applications
- Mercury 3.4L V6 FourStroke 175 HP — serial 2B529482 and up
- Mercury 3.4L V6 FourStroke 200 HP — serial 2B529482 and up
- Mercury 3.4L V6 FourStroke 225 HP — serial 2B529482 and up
- Confirm exact engine model and serial number before ordering — Mercury uses different 300-hour kits for the 4.6L V8 CMS/SeaPro/Pro XS (8M0149931) and 4.6L V8 Verado families (8M0149932)
Related Service Kits
When to Use This Kit
- At the 300-hour scheduled service interval for a compatible Mercury 3.4L V6 FourStroke
- Covers lubrication, fuel, ignition, cooling, belt-drive, and corrosion-protection maintenance in one service event
- Any time a comprehensive engine service is required for this engine family
Service Interval
This kit covers the 300-hour major service interval specified in the Mercury maintenance schedule for 3.4L V6 FourStroke outboards. Follow all applicable Mercury service procedures for each component during the service event.
Installation Notes
- Follow the Mercury maintenance schedule and service procedures for each component in the kit
- Inspect the water-pump housing, belt tensioner, thermostat housing, fuel system connections, anode mounting surfaces, and drain-plug sealing areas while the engine is being serviced
- Purchase engine oil and gear lubricant separately to complete the service
- Record the service date and hours at completion
Technical FAQ
What is the difference between 8M0149930, 8M0149931, and 8M0149932?
These three kits look nearly identical but are engine-specific. 8M0149930 is for the 3.4L V6 FourStroke. 8M0149931 is for the 4.6L V8 CMS, SeaPro, and Pro XS. 8M0149932 is for the 4.6L V8 Verado and Verado SeaPro. The components inside each kit differ to match each engine’s specific service requirements.
Is engine oil included?
No. Engine oil and gear lubricant are not included in this kit and must be purchased separately.
How do I confirm this kit is right for my engine?
Confirm the engine displacement (3.4L), configuration (V6), and serial number (2B529482 and up) against the application list above. If your engine is a V8 or a Verado, it requires a different kit.
Parts Desk Insights
The most common mistake with the 300-hour service kit lineup is mixing up the V6 and V8 kits — the boxes and part numbers look similar, and the engines are often the same horsepower class, which makes it easy to grab the wrong one. Always confirm the engine’s displacement and architecture (V6 vs. V8, FourStroke vs. Verado) before ordering. This kit is the right choice when a customer wants to do everything at once at the 300-hour mark and wants OEM parts throughout. Remind customers that oil and gear lube are sold separately. Browse the full Mercury Engine Maintenance Parts collection for oils, gear lube, and additional service items.
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.