Mercury 100-Hour Maintenance Kit – Fits Mercury V6 3.4L & V8 4.6L 175-300 HP (Replaces 8M0149929)

Mercury 100-Hour Maintenance Kit – Fits Mercury V6 3.4L & V8 4.6L 175-300 HP (Replaces 8M0149929)

This maintenance kit is designed for Mercury Marine 175-300 HP V6 (3.4L) and V8 (4.6L) FourStroke outboards from 2018 to the present. It provides an aftermarket alternative for regular 100-hour service intervals.

It directly replaces Mercury/Quicksilver part number 8M0149929.

• Includes key service filters and gear lube components
• Compatible with gasoline engines
• Fits engines with serial numbers 2B529482 and higher

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Oil Filter (35-8M0123025)
• 1 x Fuel Filter (35-8M0106635)
• 1 x Quart of High Performance Gear Lube
• 2 x Gearcase Drain Seals
• Marine Engine Oil (Not included in kit)

Installation Guide

1. Ensure the engine is turned off and cool before beginning maintenance.
2. Drain the old engine oil and gear lube completely from the engine and lower unit.
3. Remove the old oil filter and fuel filter from the engine.
4. Install the new oil filter (35-8M0123025) included in this kit.
5. Install the new fuel filter (35-8M0106635) included in this kit.
6. Refill the engine with the recommended marine engine oil (sold separately).
7. Refill the gearcase with the included quart of high performance gear lube.
8. Replace the gearcase drain seals with the two new seals provided.
9. Check all fittings and connections for tightness and leaks.
10. Start the engine and run it briefly to circulate new fluids.
11. Inspect for any leaks or issues after the engine has run.
12. Dispose of old oils and filters according to local regulations.

Troubleshooting & FAQ

• How do I confirm this fits my engine? Check your engine’s model, horsepower, and serial number. This kit fits Mercury V6 3.4L and V8 4.6L FourStroke engines 175-300 HP with serial numbers 2B529482 and higher from 2018 to present.
• What’s included compared to OEM parts? This listing is an aftermarket replacement built to OEM specifications using comparable materials. It includes filters and gear lube equivalent to OEM part 8M0149929, but engine oil is not included.
• How often should I replace the filters? Replace filters every 100 operational hours as part of regular engine maintenance to ensure performance and reliability.
• What are common signs I need to service with this kit? Decreased engine performance, rough idling, fuel delivery issues, or signs of contamination in oil or gear lube indicate timely replacement is needed.
• OEM vs. Aftermarket? This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
• How fast do you ship and how much does it cost? We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
• What is your warranty and return policy? This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.