4-Cylinder 40-60HP FourStroke EFI 300 Hour Maintenance Kit

Mercury Marine 4-Cylinder 40-60HP FourStroke EFI 300 Hour Maintenance Kit

The Mercury Precision Parts 8M0113483 300 Hour Maintenance Kit is a comprehensive, all-in-one service solution designed specifically for Mercury 4-cylinder 40-60HP FourStroke EFI outboards equipped with standard gearcases and serial number 1C000001 and higher. By consolidating every required 300-hour service component into a single box, this kit streamlines scheduled maintenance, reduces the risk of missing a critical part, and helps keep your Mercury outboard operating at peak performance season after season.

This kit is compatible with Mercury 40HP, 50HP, and 60HP 4-cylinder EFI FourStroke outboards with standard gearcases. It is produced to Mercury Marine's stringent original equipment manufacturer specifications, ensuring the same reliability and performance as factory-installed components. Regular adherence to the 300-hour service interval, as described in your owner's manual, helps extend engine life, improve fuel efficiency, and protect your boating investment.

All service items included in this kit can be installed using common shop tools, making it suitable for both professional marine technicians and experienced DIY boat owners. Mercury recommends using the correct Mercury 4-stroke marine engine oil and Mercury High Performance Gear Lube during service; oil, gear lube, and fuel additives are sold separately.

Key Features

• Complete selection of required 300-hour service replacement items in one box — no need to order separate parts
• Includes oil filter, low- and high-pressure fuel filter, oil drain seal, gearcase drain seals, thermostat and thermostat gaskets, four spark plugs, water pump impeller kit, power trim anode, and lower unit anodes
• Designed for Mercury 4-cylinder 40-60HP FourStroke EFI outboards with standard gearcases, serial number 1C000001 and higher
• Fits Mercury 40HP, 50HP, and 60HP 4-cylinder EFI FourStroke outboards with standard gearcase
• Produced to Mercury Marine OEM specifications for maximum performance and reliability
• Periodic maintenance is easy to perform using common shop tools
• Helps simplify scheduled maintenance and seasonal service
• Following the recommended service schedule keeps your engine running longer and stronger while protecting your investment