Mercury 8M0090559 40-60HP EFI 300-Hour Service Kit

Mercury 8M0090559 40-60HP EFI 300-Hour Service Kit

This OEM 300 hour service kit contains everything you need to keep your engine operating at peak performance. It is recommended to follow your owner's manual recommended service schedule to help keep your engine running longer and stronger.

Features

• Compatible with Mercury 40–60hp 4-cylinder FourStroke EFI outboards (BigFoot and Command Thrust gearcases, serial number 1C000001 and up)

• All-in-one kit includes oil filter, low and high-pressure fuel filters, oil drain seal, gearcase seals, and thermostat with gaskets

• Also contains four spark plugs, water impeller kit, power trim anode, and lower unit anode

• Simplifies periodic 300-hour maintenance—no need to source individual parts

• Designed for easy use with standard shop tools

• Built to OEM specifications by Mercury Marine for reliable performance and engine protection

Applications

• 4-Cylinder 40-60HP FourStroke EFI Outboards with BigFoot or Command Thrust gearcases (serial numbers 1C000001 & Higher)

Kit Contains

• Oil filter
• Low & high pressure fuel filter
• Oil drain seal
• 2‑gearcase drain seals
• Thermostat
• 2‑thermostat gaskets
• 4‑spark plugs
• Water impeller kit
• Power trim anode
• Lower unit anode

Frequently Asked Questions

What is the Mercury 8M0090559 40-60HP EFI 300-Hour Service Kit used for?

The Mercury 8M0090559 40-60HP EFI 300-Hour Service Kit is an OEM maintenance kit for periodic 300-hour service on compatible Mercury FourStroke EFI outboards. It combines key maintenance components, including filters, seals, spark plugs, a water impeller kit, thermostat, and anodes, to simplify scheduled engine maintenance.

What Mercury outboards does the 8M0090559 service kit fit?

This service kit is designed for Mercury 40-60HP 4-cylinder FourStroke EFI outboards equipped with BigFoot or Command Thrust gearcases and serial numbers 1C000001 and higher. Verify your engine's horsepower, configuration, gearcase type, and serial number before purchasing to confirm compatibility.

What parts are included in the Mercury 8M0090559 300-hour service kit?

The kit includes an oil filter, low- and high-pressure fuel filters, oil drain seal, two gearcase drain seals, thermostat, two thermostat gaskets, four spark plugs, water impeller kit, power trim anode, and lower unit anode. This provides the listed components needed for the specified 300-hour maintenance service.

Does the Mercury 8M0090559 kit include both fuel filters?

Yes. The Mercury 8M0090559 300-hour service kit contains both a low-pressure fuel filter and a high-pressure fuel filter. It also includes an oil filter, providing several of the filters listed for the scheduled maintenance service in one kit.

Does the 8M0090559 service kit include spark plugs and a water impeller?

Yes. The kit contains four spark plugs and a water impeller kit. It also includes a thermostat with two gaskets, along with a power trim anode and lower unit anode, as part of the listed components for the 300-hour service.

How should I determine when to use the Mercury 8M0090559 service kit?

Follow the service schedule recommended in your engine owner's manual. The product is described as a 300-hour service kit for the specified Mercury 40-60HP FourStroke EFI applications. Your owner's manual should be used to confirm the appropriate service interval and maintenance requirements for your engine.

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