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

The Mercury V8 4.6L Verado & SeaPro 300 Hour Service Kit – 8M0149932 provides the essential maintenance components required to perform the recommended 300-hour service on Mercury 4.6L V8 outboards. Built for demanding offshore, recreational, and commercial applications, this kit helps simplify routine maintenance while supporting long-term engine performance and reliability.

Featuring Mercury 25W-40 Synthetic Blend marine engine oil and SAE 90 High Performance Gear Lube, this service kit includes the critical components commonly replaced during the 300-hour maintenance interval. Routine service helps maintain proper lubrication, cooling efficiency, fuel system performance, and corrosion protection to keep your Mercury V8 operating at its best season after season.

What’s Included in This Kit

• 1 x Mercury 300 Hour Maintenance Kit
• 1 x Gallon Mercury 25W-40 Synthetic Blend Marine Engine Oil
• 3 x Quarts Mercury 25W-40 Synthetic Blend 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 Engine Lubrication: Mercury 25W-40 Synthetic Blend oil helps reduce friction and wear under demanding marine operating conditions.
• Protects Gearcase Components: Fresh SAE 90 High Performance Gear Lube helps shield gears and bearings from excessive wear and heat.
• Supports Clean Fuel Delivery: Replacement fuel filters help maintain consistent fuel flow and throttle response.
• Maintains Cooling System Efficiency: Water pump and thermostat service components help regulate proper engine temperature.
• Improves Ignition Performance: New spark plugs help support reliable starting and smooth engine operation.
• Helps Reduce Corrosion: Replacement anodes and seals help protect critical components in harsh marine 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.