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Mercury | 300 Hour Service Kit | V8 4.6L FourStroke|

8M0149931

The Mercury V8 (4.6L) FourStroke 300 Hour Service Kit – 8M0149931 provides the essential components required to perform the recommended 300-hour maintenance on Mercury 4.6L V8 FourStroke outboards. This complete kit includes the necessary engine oil, gear lube, filters, ignition components, cooling system parts, and service items required to properly maintain your engine.

The 300-hour service interval addresses several critical wear components that help maintain engine reliability, cooling efficiency, and overall performance. By bundling the required maintenance parts together, this kit helps simplify scheduled service and ensures your Mercury V8 FourStroke continues operating smoothly and efficiently.

What’s Included in This Kit

• 1 x Gallon Marine Engine Oil
• 3 x Quarts Marine Engine Oil
• 1 x Quart Mercury High Performance Gear Lube
• 1 x Oil Filter
• 1 x Fuel Filter
• 2 x Gearcase Drain Seals
• 1 x Thermostat
• Spark Plugs
• 1 x Alternator Belt
• 1 x Water Pump Repair Kit
• Anodes

Benefits of the 300 Hour Service

• Maintain proper engine lubrication with fresh Mercury marine engine oil.
• Protect internal components with a replacement oil filter.
• Support clean fuel delivery with a new fuel filter.
• Maintain cooling system efficiency with a thermostat and water pump repair kit.
• Ensure proper ignition performance with new spark plugs.
• Protect charging system reliability with a replacement alternator belt.
• Prevent corrosion with replacement anodes.

Engine Compatibility

• Mercury V8 FourStroke Outboards – 4.6L

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

• Engine Application
  • 300 HP 4.6L V8 - 2B529482 & Up
  • 225 HP 4.6L V8 SeaPro - 2B529482 & Up
  • 250 HP 4.6L V8 SeaPro - 2B529482 & Up
  • 250 HP 4.6L V8 - 2B529482 & Up
  • 300 HP 4.6L V8 SeaPro - 2B529482 & Up
  • 200 HP 4.6L V8 Pro XS - 2B529482 & Up
  • 225 HP 4.6L V8 Pro XS - 2B529482 & Up
  • 205 HP 4.6L V8 Pro XS - 2B529482 & Up
  • 300 HP 4.6L V8 Pro XS - 2B529482 & Up