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Outboard Motor Parts | OEM & Aftermarket
Shop OEM and aftermarket outboard motor parts for Mercury, Yamaha, Suzuki, Honda, Johnson / Evinrude / E-TEC, Tohatsu / Nissan, and Chrysler / Force engines. Pro Marine USA carries parts for routine maintenance, troubleshooting, repair, and complete marine engine rebuilds.
Browse by outboard manufacturer or engine system, or use our OEM parts lookup to identify the correct part number before ordering. Find cooling, fuel, ignition, electrical, internal engine, lower unit, steering, trim, service kit, gasket, seal, and rebuild parts in one place.
Shop Outboard Parts by Manufacturer
Chrysler / Force Outboard Parts for Chrysler and Force outboard repair
Honda Outboard Honda cooling, fuel, electrical, and engine parts
Johnson / Evinrude / E-TEC Outboard Johnson, Evinrude, E-TEC, and OMC replacement parts
Mercury Outboard Mercury and Mariner maintenance, repair, and rebuild parts
Suzuki Outboard Suzuki service, lower unit, fuel, and engine parts
Tohatsu / Nissan Outboard Tohatsu and Nissan outboard replacement parts
Yamaha Outboard Yamaha maintenance, repair, lower unit, and rebuild parts Find the Correct Outboard Part
Not sure which part fits your engine? Start with the engine manufacturer, horsepower, model number, serial number, and year whenever available.
Our OEM parts lookup lets you view factory parts diagrams and identify the original part number for many popular outboard engines. Once you have the OEM number, search Pro Marine to find available OEM and aftermarket replacement options.
Use Our OEM Parts Lookup »Shop Outboard Parts by Engine System
Outboard engines use several interconnected systems. Select your manufacturer above to browse the exact categories available for your engine, including the following common repair and maintenance areas.
Common Outboard Problems and Where to Start
- Engine overheating: inspect the water pump, impeller, thermostat, pressure-control components, cooling passages, and engine anodes.
- Hard starting or rough idle: check fuel delivery, carburetor or injector operation, spark plugs, ignition components, filters, and intake sealing.
- Weak spark or no spark: test ignition coils, stators, switch boxes or ignition modules, sensors, wiring, grounds, and related electrical components.
- Low compression or poor power: inspect pistons, rings, cylinder condition, head and powerhead gaskets, bearings, and other internal engine components.
- Milky gear lube: inspect prop shaft, driveshaft, shift shaft, bearing carrier, and other lower unit seals for water intrusion.
- Lower unit or gearcase noise: inspect bearings, gears, clutch components, shafts, and gear lube condition before continued operation.
- Trim or steering problems: inspect hydraulic fluid level, seals, hoses, trim motors, pumps, steering cylinders, and mechanical connections.
Why Buy Outboard Parts from Pro Marine USA?
- OEM and aftermarket replacement options for major outboard engine brands.
- Marine engine parts for routine maintenance, professional repair, and complete rebuild projects.
- OEM diagram and part-number lookup tools to help identify the correct component before ordering.
- Dealer pricing available for qualified marine repair businesses and dealers.
- Large selection of service kits, engine parts, lower unit components, fuel system parts, electrical parts, steering, and rigging products.
- Same-day weekday shipping available on qualifying in-stock orders placed before the shipping cutoff.
OEM and Aftermarket Outboard Parts
OEM parts are supplied by the original engine manufacturer and are designed for the specific engine application. Aftermarket parts are replacement components produced by independent marine parts manufacturers and may provide additional availability or value for many common repairs.
Pro Marine carries both genuine OEM parts and quality aftermarket replacement parts for many outboard maintenance, repair, and rebuild applications. Always confirm fitment using the engine model, serial number, horsepower, year range, or OEM part number when available.
Frequently Asked Questions
How do I find the correct parts for my outboard motor?
Start by identifying the engine manufacturer, horsepower, model number, serial number, and year. Select the manufacturer above to browse by engine system, or use the OEM parts lookup to locate the original part number from a factory diagram.
Can I search Pro Marine by OEM part number?
Yes. If you already have the OEM part number, enter it 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.
What information should I have before ordering an outboard part?
Have the engine manufacturer, horsepower, model number, serial number, and year whenever possible. An OEM part number from the original component or parts diagram is especially helpful because visually similar parts may fit different engine families.
What is the difference between OEM and aftermarket outboard parts?
OEM parts come from the original engine manufacturer. Aftermarket parts are replacement components manufactured by other marine parts companies for compatible applications. Pro Marine carries both OEM and aftermarket options across many common outboard engine systems.
Are aftermarket outboard motor parts reliable?
Quality aftermarket marine parts are commonly used for maintenance, professional repair, and engine rebuilding. The best option depends on the application, manufacturer, availability, and customer preference.
Do you carry parts for older outboard motors?
Yes. Pro Marine carries parts for many older Mercury, Mariner, Johnson, Evinrude, Chrysler, Force, Yamaha, Honda, Suzuki, Nissan, and Tohatsu outboards. Availability varies by engine family and component.
What outboard parts are commonly replaced during routine maintenance?
Common maintenance items include engine oil, oil filters, fuel filters, spark plugs, water pump impellers, complete water pump kits, thermostats, gear lube, drain plug seals, anodes, and manufacturer-specific service kit components.
Fitment Tip: Outboard parts can vary by model, serial range, horsepower, and production year. Confirm the OEM part number or engine identification information whenever possible before ordering.
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OEM Mercury High-Performance Marine Engine Oil
Mercury SAE 25W50 Synthetic Blend Marine Engine Oil - 1 Gallon
Mercury 858084 is a premium SAE 25W50 synthetic blend 4-stroke marine engine oil designed for Mercury Verado, Mercury Racing, FormulaRace, and other high-performance marine engines where Mercury specifies 25W50 FC-W marine oil.
This gallon-size OEM Mercury marine oil provides outstanding wear protection, corrosion resistance, viscosity stability, and sludge protection for demanding marine applications and high-horsepower engines.
Recommended Applications
| Engine Family | Application | Oil Specification | Notes |
|---|---|---|---|
| Mercury Verado | 4-Stroke Outboards | SAE 25W50 FC-W | Use where Mercury specifies 25W50 oil |
| Mercury Racing | High-Performance Outboards | SAE 25W50 FC-W | Recommended for Racing 4-stroke applications |
| FormulaRace Engines | Performance Marine Engines | SAE 25W50 FC-W | OEM Mercury recommendation |
| Mercury Racing Sterndrives | 525 EFI through 1650 | SAE 25W50 FC-W | High-horsepower sterndrive applications |
Mercury 25W50 marine engine oil is engineered specifically for high-load marine applications and is formulated to help protect against corrosion, varnish buildup, sludge formation, and viscosity breakdown in harsh marine environments.
This oil meets or exceeds FC-W marine oil requirements when SAE 25W50 oil is specified by Mercury Marine.
Always verify your owner's manual or service manual before ordering. Mercury uses multiple oil viscosities depending on engine family, horsepower range, operating temperature, and application.
This oil is specifically intended for applications where SAE 25W50 marine oil is required.
Available Oil Size Options
| Oil Package | Product | Best For |
|---|---|---|
| 1 Gallon Jug | Mercury Verado 25W50 Oil - 1 Gallon | Complete oil changes and multi-engine service |
| 1 Quart Bottle | Mercury 25W50 Marine Oil - 1 Quart | Top-offs and adding exact oil quantities |
Complete Your Service
What This Oil is Used For
Mercury 858084 SAE 25W50 marine engine oil is used in high-performance Mercury marine engines requiring FC-W rated 25W50 oil protection.
It is commonly used in Mercury Verado outboards, Mercury Racing outboards, FormulaRace engines, and Mercury Racing sterndrive applications.
Mercury formulated this oil specifically for marine operating conditions, including sustained RPM operation, moisture exposure, corrosion resistance, and high engine loads.
The gallon container is ideal for complete oil changes, multi-engine boats, dealer service departments, and customers maintaining larger Mercury outboards and sterndrive engines.
Key Features and Benefits
- OEM Mercury Marine engine oil
- SAE 25W50 synthetic blend formulation
- Designed for high-performance marine engines
- Recommended for Mercury Verado applications
- Recommended for Mercury Racing outboards and sterndrives
- Provides excellent wear and corrosion protection
- Helps resist sludge and varnish buildup
- Maintains viscosity under demanding operating conditions
- Meets or exceeds FC-W marine oil requirements
- 1 gallon container size
Oil Details
- Part Number: 858084
- Oil Type: Synthetic Blend Marine Engine Oil
- Viscosity: SAE 25W50
- Certification: FC-W Marine Oil
- Container Size: 1 Gallon
- Brand: Mercury Marine
- Application: High-Performance 4-Stroke Marine Engines
FAQ
Is this the correct oil for Mercury Verado engines?
Yes, this oil is commonly recommended for Mercury Verado outboards where Mercury specifies SAE 25W50 FC-W marine engine oil.
Is this a full synthetic oil?
No. Mercury 858084 is a synthetic blend marine engine oil.
Does this oil meet FC-W requirements?
Yes. This oil meets or exceeds marine engine manufacturer warranty requirements and recommendations for FC-W marine engine oil when SAE 25W50 is specified.
Can I use this in Mercury Racing applications?
Yes. Mercury specifically recommends this oil for many Mercury Racing four-stroke outboards and sterndrive engines.
How much oil does my engine require?
Oil capacity varies by engine model and application. Always check your owner's manual or service manual for exact oil quantity requirements.
Can I combine this gallon with quart bottles?
Yes. Many larger Mercury engines require additional quarts beyond a single gallon, so customers often combine gallon and quart containers for complete oil changes.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or marine industry professional? We offer dealer pricing for qualified 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.
- Oil and lubricants must be unopened and unused for return eligibility.
- Return authorization is required before sending items back.
Need help with a return or product question?
Contact Us
Phone: 941-721-3000
Searchable Terms
858084, Mercury 25W50 oil, Mercury Verado oil, Mercury Racing oil, Mercury marine engine oil, Mercury 25W50 gallon, Verado engine oil, Mercury Racing sterndrive oil, FormulaRace oil, Mercury FC-W oil, Mercury high-performance marine oil, Mercury 25W50 gallon jug, Mercury Verado gallon oil
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