Mercury Verado L6 100 & 300 Hour Service Maintenance Kits – Fits Mercury 200-350 HP Verado L6 (8M0120657, 8M0097858, 8M0097859, 8M0133617)

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Mercury Verado L6 100 & 300 Hour Service Maintenance Kits – Fits Mercury 200-350 HP Verado L6 (8M0120657, 8M0097858, 8M0097859, 8M0133617) is backordered and will ship as soon as it is back in stock.

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Delivery and Shipping

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This listing includes Mercury Verado L6 100 & 300 Hour Service Maintenance Kits specifically designed for Mercury Marine 6-cylinder Verado outboards from 200 HP to 350 HP (4-Stroke, 2004–Present). These kits bundle the essential components required for scheduled 100-hour or 300-hour service intervals, ensuring your engine runs reliably.

These kits are direct replacements for OEM part numbers 8M0120657, 8M0097858, 8M0097859, and 8M0133617. Please confirm your engine's serial number to select the correct kit.

Available for both 100-hour and 300-hour maintenance schedules.
Kit contents vary based on the engine serial number (split at 2B144122 / 2B144123).
Suitable for professional or experienced DIY installation.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number	Notes
Mercury	8M0120657	100-Hour Kit for S/N 2B144123 & Above
Mercury	8M0097858	100-Hour Kit for S/N 2B144122 & Below
Mercury	8M0097859	300-Hour Kit for S/N 2B144122 & Below
Mercury	8M0133617	300-Hour Kit for S/N 2B144123 & Above

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercury	Verado L6	200	4-Stroke	2004–Present	8M0120657	S/N 2B144123 & Above (100-hour)
Mercury	Verado L6	225	4-Stroke	2004–Present	8M0120657	S/N 2B144123 & Above (100-hour)
Mercury	Verado L6	250	4-Stroke	2004–Present	8M0120657	S/N 2B144123 & Above (100-hour)
Mercury	Verado L6	275	4-Stroke	2004–Present	8M0120657	S/N 2B144123 & Above (100-hour)
Mercury	Verado L6	300	4-Stroke	2004–Present	8M0120657	S/N 2B144123 & Above (100-hour)
Mercury	Verado L6	350	4-Stroke	2004–Present	8M0120657	S/N 2B144123 & Above (100-hour)
Mercury	Verado L6	200	4-Stroke	2004–Present	8M0097858	S/N 2B144122 & Below (100-hour)
Mercury	Verado L6	225	4-Stroke	2004–Present	8M0097858	S/N 2B144122 & Below (100-hour)
Mercury	Verado L6	250	4-Stroke	2004–Present	8M0097858	S/N 2B144122 & Below (100-hour)
Mercury	Verado L6	275	4-Stroke	2004–Present	8M0097858	S/N 2B144122 & Below (100-hour)
Mercury	Verado L6	300	4-Stroke	2004–Present	8M0097858	S/N 2B144122 & Below (100-hour)
Mercury	Verado L6	350	4-Stroke	2004–Present	8M0097858	S/N 2B144122 & Below (100-hour)
Mercury	Verado L6	200	4-Stroke	2004–Present	8M0097859	S/N 2B144122 & Below (300-hour)
Mercury	Verado L6	225	4-Stroke	2004–Present	8M0097859	S/N 2B144122 & Below (300-hour)
Mercury	Verado L6	250	4-Stroke	2004–Present	8M0097859	S/N 2B144122 & Below (300-hour)
Mercury	Verado L6	275	4-Stroke	2004–Present	8M0097859	S/N 2B144122 & Below (300-hour)
Mercury	Verado L6	300	4-Stroke	2004–Present	8M0097859	S/N 2B144122 & Below (300-hour)
Mercury	Verado L6	350	4-Stroke	2004–Present	8M0097859	S/N 2B144122 & Below (300-hour)
Mercury	Verado L6	200	4-Stroke	2004–Present	8M0133617	S/N 2B144123 & Above (300-hour)
Mercury	Verado L6	225	4-Stroke	2004–Present	8M0133617	S/N 2B144123 & Above (300-hour)
Mercury	Verado L6	250	4-Stroke	2004–Present	8M0133617	S/N 2B144123 & Above (300-hour)
Mercury	Verado L6	275	4-Stroke	2004–Present	8M0133617	S/N 2B144123 & Above (300-hour)
Mercury	Verado L6	300	4-Stroke	2004–Present	8M0133617	S/N 2B144123 & Above (300-hour)

Technical Specs

Product Type: Service Maintenance Kit
Installation: Professional or DIY Maintenance
Fuel Type: Gasoline
Weight: 1.89 lbs (0.86 kg) for 8M0120657 kit
Product Dimensions: 28.0" L x 23.0" W x 10.0" H
Fitting Type: OEM specified
Warranty: Manufacturer limited warranty
Other Technical Attributes: Kits vary by engine serial number

What’s in the Box

100-Hour Kit (8M0120657 / 8M0097858)

1 x Oil Filter (35-877769K01)
1 x Fuel Filter (35-8M0095659/8M0157616)
1 x Oil Drain Seal
2 x Gearcase Drain Seals

300-Hour Kit (8M0097859 / 8M0133617)

1 x Oil Filter
1 x Fuel Filter
1 x Thermostat Kit
1 x Water Pump Impeller Kit
1 x Belt

Optional Add-on: Complete service kits are available that also include Mercury-specified engine oil (10W-30 or 25W-40) and High Performance Gear Lube.

Installation Notes

Before starting, ensure you have the correct kit for your engine's serial number and have all necessary tools and safety equipment.
Disconnect the battery to prevent accidental starting. Place a suitable container under the engine to catch fluids.
Drain the engine oil and gearcase lube. Inspect fluids for any signs of water or metal shavings.
Replace the oil filter and fuel filter, ensuring a tight seal. Replace the drain seals.
For 300-hour service: replace the water pump impeller, thermostat, spark plugs, and anodes as included in your kit.
Refill the engine with the manufacturer-specified grade and quantity of engine oil and gear lube.
Reconnect the battery and start the engine. Check carefully for any oil or fuel leaks.

Troubleshooting & FAQ

How do I know which kit is right for my Verado engine?

The correct kit depends on two factors: the service interval (100 or 300 hours) and your engine's serial number. The cutoff is serial number 2B144122 / 2B144123. Please check your engine's serial number plate and use our compatibility table to find the matching OEM part number.

What is the difference between the 100-hour and 300-hour kits?

The 100-hour kit covers basic service items like an oil change and fuel filter replacement. The 300-hour kit is more comprehensive, adding critical components for a major service, such as a water pump impeller, thermostat, belt, spark plugs, and anodes.

Why are there different kits for different serial numbers?

Mercury Marine made changes to the Verado L6 engine design at serial number 2B144123. These changes affected parts like the fuel filter, requiring different components for proper fitment. Using the wrong kit can lead to fuel system issues or improper sealing.

What are signs my outboard needs a service?

Aside from tracking engine hours, look for signs like a drop in performance, difficulty starting, increased fuel consumption, or engine overheating. Regularly inspecting your filters and fluids can also reveal contamination that indicates a need for service.

Can I use this kit for a 400 HP Verado L6 model?

While some components may be compatible, these kits are specifically listed for 200–350 HP models. We recommend checking your 400 HP model's specific part number requirements before purchasing to ensure full compatibility.

Is professional installation required?

While many experienced boat owners perform this maintenance themselves, professional installation is recommended, especially for the 300-hour service which involves more complex tasks like replacing the water pump impeller. This ensures all parts are installed correctly and torqued to spec.

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

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Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.

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