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Mercury Outboard Parts
Shop OEM and aftermarket Mercury outboard parts for maintenance, repair, troubleshooting, and complete engine rebuild projects. Browse Mercury marine parts by system, including cooling, fuel delivery, electrical and ignition, internal engine components, lower unit parts, steering, trim, and routine service items.
Pro Marine USA carries Mercury outboard engine parts for a wide range of 2-stroke, FourStroke, EFI, Optimax, Pro XS, SeaPro, and Verado applications. Use your engine horsepower, model, serial number, or OEM part number whenever possible to confirm fitment before ordering.
Shop Mercury Outboard Parts by System
- Complete Powerheads
- Control Cables & Boxes
- Cooling System
- Cowlings & Components
- Electrical System
- Engine Oil
- Engine Rebuild Kits
- Fuel & Carburetion System
- Intake System
- Internal Engine Components
- Lower Unit Components
- Oiling System
- Paints
- Service & Oil Change Kits
- Service Manuals
- Steering Systems
- Throttle Components
- Transom & Midsection
- Trim System
- Wizard Performance Parts
Find the Correct Mercury Outboard Part
Mercury outboard parts can vary by horsepower, engine family, model year, and serial number range. If you are unsure which component fits your engine, use the OEM parts lookup to locate the original Mercury part number from an engine diagram.
Once you have the OEM part number, search Pro Marine to find available genuine Mercury and aftermarket replacement options.
Use Our OEM Parts Lookup »Common Mercury Outboard Engine Families
Pro Marine supports many Mercury outboard applications across a wide horsepower range. Always confirm the engine serial number and model information before ordering parts.
- Portable and Midrange: Mercury 2.5HP through 60HP 2-stroke and FourStroke applications
- FourStroke and EFI: common 75HP through 300HP Mercury EFI and FourStroke platforms
- Pro XS: performance-oriented Mercury Pro XS outboards across multiple engine families
- Optimax: direct-injected 2-stroke Mercury Optimax engines, commonly 75HP through 250HP
- Verado: supercharged and naturally aspirated Mercury Verado applications from 135HP through current high-horsepower platforms
- SeaPro: commercial-duty Mercury SeaPro outboards used in professional and high-hour applications
Common Mercury Outboard Repair Areas
- Overheating: inspect the water pump, impeller, thermostat, poppet valve, cooling passages, and related cooling components.
- Hard starting or rough running: inspect fuel pumps, filters, injectors or carburetors, spark plugs, coils, sensors, and intake components.
- No spark or intermittent ignition: check ignition coils, stators, switch boxes, trigger assemblies, sensors, grounds, and wiring.
- Low compression or power loss: inspect pistons, rings, cylinders, bearings, gaskets, reeds, and internal engine components.
- Lower unit noise or water intrusion: inspect seals, bearings, gears, shafts, bearing carriers, and gear lube condition.
- Trim or steering problems: inspect trim motors, pumps, hydraulic components, steering cylinders, hoses, and related rigging parts.
Why Buy Mercury Outboard Parts from Pro Marine USA?
- OEM Mercury and aftermarket replacement options for many common applications.
- Parts for maintenance, repair, engine rebuilding, lower units, electrical systems, fuel systems, steering, trim, and rigging.
- OEM diagram and part-number lookup tools to help identify the correct part before ordering.
- Dealer pricing available for qualified marine repair businesses and dealers.
- Large inventory of Mercury service parts and hard-to-find marine engine components.
- Fast weekday shipping on qualifying in-stock orders.
Frequently Asked Questions
How do I find the correct Mercury outboard part?
Use the engine horsepower, model, serial number, and year whenever available. Mercury frequently uses serial-number ranges to identify engine families, so the serial number is often the most reliable way to confirm fitment.
Can I search Mercury parts by OEM part number?
Yes. Enter the Mercury OEM part number into the Pro Marine site search to locate available OEM and aftermarket replacement options. If you do not know the part number, use the OEM parts lookup first.
Do Mercury outboard parts vary by serial number?
Yes. Many Mercury components change by serial-number range even within the same horsepower or model family. Always compare the serial range listed for the part with your engine before ordering.
Do you carry parts for Mercury Optimax and Verado engines?
Yes. Pro Marine carries parts for many Mercury Optimax, Verado, Pro XS, EFI, FourStroke, and SeaPro applications, including maintenance, fuel, electrical, cooling, internal engine, lower unit, steering, and rigging components.
Do you carry both OEM and aftermarket Mercury parts?
Yes. Pro Marine offers genuine Mercury parts along with aftermarket replacement parts for many common Mercury outboard maintenance, repair, and rebuild applications.
What Mercury outboard parts are commonly replaced during routine maintenance?
Common maintenance items include engine oil, oil filters, fuel filters, spark plugs, water pump kits, impellers, thermostats, gear lube, drain plug seals, anodes, and manufacturer-specific service kit components.
Fitment Tip: Mercury outboard parts often vary by serial-number range. Confirm your engine serial number and OEM part number whenever possible before ordering.
0584918
0765841
0765865
584918
765865
810B
810C
883323
883323001
702755021407
OEM Mercury Extreme Performance Gear Lube
85W90 Racing & High-Performance Marine Gear Lubricant
Mercury Extreme Performance Gear Lube 8M0111677 is an 85W90 gear lubricant designed for outboard and sterndrive racing applications.
It is also built for high-performance gear cases used in marine, powersports, and motorsports applications where maximum wear protection, heat resistance, and oil film strength are critical.
Compatible Applications
| Application | System Type | Use | Notes |
|---|---|---|---|
| Outboard Racing | High-Performance Gearcase | Extreme Gear Protection | Designed for racing outboard applications |
| Sterndrive Racing | Sterndrive Gear Housing | High-Load Lubrication | Designed for sterndrive racing applications |
| High-Performance Marine Gearcases | Gearcase / Lower Unit | Wear & Heat Protection | For demanding marine performance use |
| Powersports & Motorsports | High-Performance Gear Cases | Extreme Pressure Protection | For compatible gearcase applications requiring 85W90 |
For standard recreational marine lower units, Mercury Premium 80W90 gear lube may be the better choice.
View Mercury Premium Gear Lube 80W90
OEM Part Numbers & Product Information
| Type | Details |
|---|---|
| Mercury Part Number | 8M0111677 |
| Product Type | Extreme Performance Marine Gear Lube |
| Viscosity | SAE 85W90 |
| Application | Racing & High-Performance Gearcases |
| Brand | Mercury Marine |
What This Gear Lube is Used For
Mercury Extreme Performance Gear Lube is used in outboard and sterndrive racing applications where gearcases operate under extreme load, high temperature, and high-performance conditions.
It is also suitable for compatible high-performance gear cases used in marine, powersports, and motorsports applications requiring an 85W90 extreme performance gear lubricant.
The formula includes tackifiers and pressure additives that improve oil film adhesion and help protect gears from excessive wear.
Advanced emulsifiers help protect internal gearcase components if water enters the gear housing, helping maintain protection in harsh marine environments.
Key Features and Benefits
- OEM Mercury Extreme Performance Gear Lube
- SAE 85W90 gear lubricant
- Designed for outboard and sterndrive racing applications
- Also for high-performance marine, powersports, and motorsports gearcases
- Provides maximum protection against gear and bearing wear
- Tackifiers and pressure additives improve oil film adhesion
- Helps prevent excessive wear under high-load conditions
- Helps prevent horsepower loss and resists breakdown at high gear temperatures
- Advanced emulsifiers protect gears if water enters the gear housing
Gear Lube Details
- Brand: Mercury Marine
- Part Number: 8M0111677
- Product Type: Extreme Performance Gear Lube
- Viscosity: SAE 85W90
- Use: Racing and high-performance gearcase lubrication
- Applications: Outboard, sterndrive, marine, powersports, and motorsports gearcases
- Protection: Wear, heat, pressure, and water-contamination protection
- Recommended Service: Change once each year when winterizing or every 100 hours of operation
FAQ
What is Mercury Extreme Performance Gear Lube used for?
It is designed for outboard and sterndrive racing applications and other compatible high-performance gearcases.
What viscosity is this gear lube?
This Mercury Extreme Performance Gear Lube is SAE 85W90.
How is this different from Mercury Premium 80W90 Gear Lube?
Extreme Performance Gear Lube is intended for racing and high-performance gearcases, while Premium 80W90 is typically used for standard recreational marine lower units.
Does this help if water enters the gear housing?
Yes. Mercury states that advanced emulsifiers help protect gears if water enters the gear housing.
How often should this gear lube be changed?
Mercury recommends changing it once each year when winterizing the engine or every 100 hours of operation.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1–5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Lubricants and chemicals must remain unopened and unused for return eligibility.
- Items must be in original packaging and resalable condition.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
8M0111677, Mercury Extreme Performance Gear Lube, Mercury 85W90 gear lube, Mercury racing gear lube, Mercury high performance gear oil, Mercury outboard racing gear lube, Mercury sterndrive racing gear lube, 85W90 marine gear lubricant, extreme performance marine gear oil, Mercury gearcase lubricant, Mercury performance gearcase oil, racing lower unit gear lube