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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.
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
Mercury 25W50 Oil - 1 Quart
OEM Mercury SAE 25W50 synthetic blend marine engine oil quart bottle for topping off or combining with gallon containers for complete oil changes.
View Product
Mercury 4-Stroke Service Kits
Shop OEM Mercury 4-stroke service kits including oil change kits, 100 hour kits, and 300 hour maintenance kits for Verado and FourStroke engines.
View Service KitsWhat 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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