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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
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120hp 1995
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BF75 1997-1998
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Johnson / EvinrudeÂ
100hp Crossflow 1984-1989
120hp Looper 1985
 140hp Looper 1985
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175hp Crossflow 1986-1987Â
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