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Mercury | 300 Hour Service Kit | 8M0097855

When your Mercury 2.1L four-stroke reaches the 300 hour service interval, it is time for more than a basic oil change. This complete kit is built around 25W-40 four-stroke oil and bundles the major milestone-service items into one package—engine oil, gear lube, key filters, water pump components, ignition parts, and corrosion protection. It is a clean way to refresh wear items, restore cooling system confidence, and keep your outboard running smoothly through long days on the water.

What’s Included in This Kit

• 1x 25W-40 Four Stroke Oil (Gallon)
• 2x 25W-40 Four Stroke Oil (Quart)
• 1x Gear Lube (Quart)
• 1x Oil Filter
• 1x In-Line Fuel Filter
• 1x Fuel Rail Filter
• 2x Gearcase Drain Seals
• 1x Water Pump Repair Kit
• 4x Spark Plugs
• 1x Thermostat Assembly
• 1x Anode Kit (Does Not Include Trim Tab Anode)
• 1x Clamp

Why This 300 Hour Service Kit Matters

• Milestone service coverage: Goes beyond oil and gear lube to address cooling, ignition, and filtration.
• Cooling system refresh: Water pump components and a thermostat help support stable operating temps.
• Fuel system protection: Includes multiple fuel filters to help keep debris out of sensitive EFI components.
• Corrosion defense: Anode kit helps reduce galvanic corrosion in common harsh-water conditions.

FAQ

Why does this kit include both an in-line fuel filter and a fuel rail filter?
They protect different parts of the fuel system—replacing both at the interval helps keep fuel flow clean and consistent.

Why are there 2 gearcase drain seals?
Many gearcases use sealing washers at both the drain and vent screws, so replacing them together helps support a proper seal.

Does the anode kit include the trim tab anode?
No, this kit does not include the trim tab anode.

Is a water pump repair kit really necessary at 300 hours?
Many 300 hour schedules include water pump service because the impeller and wear components are time-and-use sensitive.

• Engine Application
  • 75 HP EFI SeaPro - 2B095049 and up
  • 90 HP EFI - 2B095049 and up
  • 90 HP EFI SeaPro - 2B095049 and up
  • 75 HP EFI - 2B095049 and up
  • 100 HP EFI - 2B095049 and up
  • 115 HP EFI SeaPro - 2B095049 and up
  • 65 HP EFI Jet - 2B095049 and up
  • 80 HP EFI Jet - 2B095049 and up
  • 115 HP EFI - 2B095049 and up
  • 80 HP EFI - 2B095049 and up