Mercury 8M0113483 300-Hour Maintenance Kit – For Mercury 40–60 hp EFI 4-Cylinder FourStroke

The Mercury 300-Hour Maintenance Kit 8M0113483 contains all the essential genuine parts required for a complete 300-hour inspection on Mercury 40–60 hp FourStroke EFI 4-cylinder outboard motors with standard gearcase housings. This complete kit eliminates the need to order individual components and ensures that all service items can be properly addressed.

The kit includes all critical wear parts that should be replaced routinely during the major inspection—including oil filters, fuel filters, gaskets, anodes, thermostat components, spark plugs, and a complete impeller kit for the water pump. Regular 300-hour maintenance prevents unnecessary engine wear, reduces follow-on costs, and maintains the outboard's full performance.

The maintenance can be performed using standard workshop tools. For exact procedures, refer to the engine's owner's manual. All products meet Mercury Marine's strict OEM specifications and ensure maximum performance and service life.

Contents of Maintenance Kit 8M0113483:
• Oil filter
• Low-pressure fuel filter
• High-pressure fuel filter
• Oil drain plug gasket
• Gearcase gaskets
• Thermostat + thermostat gaskets
• 4 spark plugs
• Water pump impeller kit
• Power trim anode
• Lower unit anodes

Product benefits:
• Complete 300-hour inspection in one package
• Fits Mercury 40–60 hp EFI 4-cylinder FourStroke engines
• OEM quality to Mercury Marine specifications
• Optimizes engine performance, reliability, and service life
• Easy installation with standard tools
• No tedious reordering of individual parts