Mercury MerCruiser Quicksilver 100 Hour Service Kit 8M0120657
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The Mercury MerCruiser Quicksilver 100 Hour Service Kit 8M0120657 is a genuine Mercury maintenance kit designed for select Mercury L6 Verado EFI FourStroke outboards. It packages the key service components needed for a 100-hour maintenance interval in one convenient kit, helping make routine service cleaner, simpler, and easier to complete with OEM-spec parts. Mercury lists this kit for L6 200–400 HP Verado EFI outboards within the specified serial number range.
Key Features
- Genuine Mercury / Quicksilver 100-hour maintenance kit
- Part number: 8M0120657
- Designed for select Mercury L6 Verado EFI FourStroke outboards
- Helps simplify routine 100-hour service
- Includes OEM oil and fuel filtration components
- Includes required drain seals for oil and gearcase service points
- Produced to Mercury Marine OEM specifications
- Engine oil and gear lube are sold separately
Engine Compatibility
Designed for select Mercury L6 Verado EFI FourStroke outboards, commonly referenced for:
- 200 HP L6 Verado EFI
- 225 HP L6 Verado EFI
- 250 HP L6 Verado EFI
- 275 HP L6 Verado EFI
- 300 HP L6 Verado EFI
- 350 HP L6 Verado EFI
- Select 400 HP / 400R L6 Verado EFI applications when confirmed by serial number and parts diagram
Mercury's product listing references L6 200–400 HP Verado EFI outboards, serial number 2B144123 through 3B342962, while also noting use on 200–350 HP L6 Verado EFI 4-stroke outboards, serial number 2B144123 and above.
Serial Number Fitment Notice
Service kit fitment can vary by horsepower, Verado generation, engine configuration, and serial number. Always confirm 8M0120657 against your engine serial number, Mercury parts diagram, or owner's manual before ordering, especially on higher-horsepower Verado applications.
When This Part Needs Replacement
Use this kit during the scheduled 100-hour service interval, seasonal maintenance, or when replacing the oil filter, fuel filter, oil drain seal, and gearcase drain seals as part of routine service. Keeping these components fresh helps protect the lubrication and fuel systems while reducing the chance of leaks from reused drain seals.
Installation Notes
Follow the Mercury service manual or owner's manual for the correct 100-hour maintenance procedure. This kit includes the service parts, but engine oil and gear lube are not included and must be purchased separately. After service, check for leaks, verify fluid levels, and confirm proper engine operation before returning the outboard to use.
Alternate/Superseded Part Numbers
- Mercury / Quicksilver: 8M0120657
- Oil filter included: 35-877769K01
- Fuel filter references included: 35-8M0095659 / 8M0157616
- Kit contents: oil filter, fuel filter, oil drain seal, and 2 gearcase drain seals
- UPC / GTIN: 745061004580
Parts Desk Insight
This kit is a good example of why serial number confirmation matters. The kit is built around the L6 Verado 100-hour service, but Mercury references multiple horsepower ranges, so matching the engine serial number first is the safest way to make sure the maintenance kit is correct.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 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.