Shop Mercury 8HP-9.9HP EFI 300 hour service kits for scheduled 4 stroke outboard maintenance. These kits help group common maintenance parts for larger service intervals on small Mercury EFI outboards.

Always verify your Mercury model and serial number before ordering service parts.

Tip: Mercury 8HP and 9.9HP EFI engines may use different service components depending on model year and serial number range.

Common Mercury 8HP-9.9HP EFI 300 Hour Kit Items

• Oil filters and fuel filters
• Spark plugs
• Thermostats and seals when applicable
• Water pump service components when included
• Engine oil when included
• Gear lube when included

Frequently Asked Questions

What is included in a Mercury 8-9.9HP EFI 300 hour service kit?

Most kits include scheduled maintenance items such as filters, seals, spark plugs, and related service parts. Some kits may also include engine oil, gear lube, thermostats, or water pump components.

Do these kits include oil and gear lube?

Some Mercury 300 hour kits include engine oil and lower unit gear lube, while others contain only maintenance parts. Review the product listing for exact contents.

How do I choose the correct Mercury 8-9.9HP EFI kit?

Use your Mercury horsepower, model, and serial number to confirm the correct 300 hour service kit for your outboard.

Helpful Links

• Mercury 300 Hour Service Kits
• Mercury 100 Hour Service Kits
• Mercury 4 Stroke Oil Change Kits
• Mercury Outboard Parts
• OEM Schematics