Mercury Marine | 300 Hour Service Kit | V8 4.6L Verado & SeaPro | 25W-40 Marine Oil | 8M0149932

The Mercury V8 4.6L Verado & SeaPro 300 Hour Service Kit – 8M0149932 provides the essential maintenance components needed to complete the recommended 300-hour service interval on Mercury 4.6L V8 outboards. Designed for high-performance recreational and commercial applications, this kit helps keep your engine properly lubricated, protected, and operating reliably through extended hours on the water.

By combining the required engine oil, gear lube, filters, and key maintenance components into one convenient package, this service kit simplifies scheduled maintenance while helping maintain engine performance, fuel efficiency, cooling system function, and corrosion protection. Completing routine 300-hour service is one of the best ways to extend the life and reliability of your Mercury V8 outboard.

What’s Included in This Kit

• 1 x Mercury 300 Hour Maintenance Kit
• 1 x Gallon Mercury 25W-40 Marine Engine Oil
• 3 x Quarts Mercury 25W-40 Marine Engine Oil
• 1 x Quart Mercury SAE 90 High Performance Gear Lube

Typical Service Components Included

• Oil Filter
• Fuel Filters
• Spark Plugs
• Thermostat
• Alternator Belt
• Water Pump Repair Components
• Gearcase Drain Seals
• Corrosion Protection Anodes

Benefits of the 300 Hour Service

• Maintains Proper Lubrication: Mercury 25W-40 oil helps protect internal engine components from friction and wear.
• Protects the Gearcase: Fresh SAE 90 High Performance Gear Lube helps guard gears and bearings under heavy marine loads.
• Supports Reliable Fuel Delivery: Replacement fuel filters help maintain clean fuel flow and consistent engine performance.
• Maintains Cooling Efficiency: Thermostat and water pump service components help regulate proper engine operating temperature.
• Improves Ignition Performance: New spark plugs help support clean starts, smooth idle, and reliable combustion.
• Helps Reduce Corrosion: Replacement anodes and seals help protect vital engine components in harsh saltwater environments.

Engine Compatibility

• Mercury V8 4.6L Verado Outboards
• Mercury V8 4.6L SeaPro Outboards
• Mercury 250HP–300HP V8 Models

Always verify your Mercury outboard model and serial number before ordering to ensure compatibility with your engine.