300 Hour Service Kit – Fits Mercury Verado L6 200-300HP 4-Stroke Engines (Replaces 8M0097859)
300 Hour Service Kit – Fits Mercury Verado L6 200-300HP 4-Stroke Engines (Replaces 8M0097859) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This 300 Hour Service Kit – Fits Mercury Verado L6 200-300HP 4-Stroke Engines (Replaces 8M0097859) provides all necessary components for the 300-hour maintenance interval on Mercury Verado L6 (inline 6-cylinder) four-stroke outboards. It is specifically designed for engines with serial numbers 2B144122 and lower.
This kit is a direct replacement for Mercury part number 8M0097859 and serves as an alternative to the kit for later models, 8M0133617 (for S/N 2B144123 and above).
- Includes OEM-spec replacement parts for a direct fit.
- Covers all essential items for the 300-hour scheduled service.
- Designed for gasoline-fueled Mercury Verado L6 engines.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury | 8M0097859 | For S/N 2B144122 and lower |
| Mercury | 8M0133617 | Direct replacement for S/N 2B144123 and above |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury Marine engines, verify your model, horsepower, and serial number range to ensure correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | Verado L6 | 200 | 4-Stroke | 2005–2015 | 8M0097859 | For S/N 2B144122 and lower |
| Mercury | Verado L6 | 225 | 4-Stroke | 2005–2015 | 8M0097859 | For S/N 2B144122 and lower |
| Mercury | Verado L6 | 250 | 4-Stroke | 2005–2015 | 8M0097859 | For S/N 2B144122 and lower |
| Mercury | Verado L6 | 275 | 4-Stroke | 2005–2015 | 8M0097859 | For S/N 2B144122 and lower |
| Mercury | Verado L6 | 300 | 4-Stroke | 2005–2015 | 8M0097859 | For S/N 2B144122 and lower |
Technical Specs
- Product Type
- Maintenance Service Kit
- Installation
- OEM Replacement Parts
- Fuel Type
- Gasoline
- Connection
- Direct OEM Fitment
- Housing Material
- Various (Multiple Components)
- Housing Color
- Various (Multiple Components)
- Dimensions
- 16.5" x 32.0" x 22.2"
- Fitting Type
- OEM Specification
- Thread Size
- Various (Multiple Components)
- Other Technical Attributes
- For 300-hour scheduled maintenance interval
What’s in the Box
- 1 x Oil Filter (35-877769K01)
- 1 x Spin-on Fuel Filter (8M0157616)
- 1 x High Pressure Fuel Filter Screen
- 1 x Oil Drain Seal
- 2 x Gearcase Drain Seals
- 6 x Spark Plugs (ILFR6G-E)
- 1 x Thermostat Assembly Kit
- 1 x Upper Water Pump Impeller Repair Kit
- 1 x Drive Belt
- 1 x Clamp 36.1 mm
- 1 x Aluminum Anode Kit
Installation Notes
- Ensure the engine is cool to the touch and disconnect the battery for safety.
- Change the engine oil, replacing the old oil filter and oil drain seal.
- Drain and replace the gearcase lubricant, using the new gearcase drain seals.
- Install the new spin-on fuel filter and high-pressure fuel filter screen.
- Replace all six spark plugs, ensuring they are torqued to spec.
- Install the new thermostat assembly and the upper water pump impeller repair kit.
- Replace the old drive belt with the new one and verify correct tension.
- Inspect and replace the engine anodes using the new aluminum anode kit.
- After all components are installed, reconnect the battery and test the engine in a safe, water-supplied environment.
Troubleshooting & FAQ
Which Mercury Verado engines is this service kit for?
This kit is designed for Mercury Verado L6 200, 225, 250, 275, and 300 HP 4-stroke engines manufactured from 2005–2015 with serial numbers 2B144122 and lower.
How do I know if this kit fits my engine's serial number?
Your engine's serial number is typically found on a metal plate or sticker on the transom mounting bracket or on the engine block itself. Confirm it is 2B144122 or lower before ordering.
What is the difference between this kit and the one for newer engines (8M0133617)?
The primary difference lies in specific components designed to fit the engineering changes in later model engines (S/N 2B144123 and up). Using the wrong kit can result in incorrect fitment and potential engine issues.
How often should I use this service kit?
This kit provides all the necessary parts for the 300-hour (or three-year) scheduled maintenance interval, whichever occurs first. Please refer to your engine's service manual for specific recommendations.
What are signs my engine needs its 300-hour service?
Beyond reaching the 300-hour mark, common indicators include a decrease in engine performance, difficulty starting, elevated engine temperatures, or a noticeable drop in fuel efficiency.
Does this kit include everything required for the 300-hour service?
This kit includes all the standard replacement parts recommended by the manufacturer for a 300-hour service interval. However, we always recommend consulting your engine’s official service manual for a complete checklist of required actions.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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