Marine Gear Lube

Protect Your Lower Unit with Marine Gear Lube & Lower Unit Oil

Keep your outboard or sterndrive performing flawlessly with marine gear lube from The Outdoor Warehouse. Our high-pressure lubricants are formulated to protect lower units and transmissions from corrosion, foaming, and metal wear in demanding marine environments.

Also known as lower unit oil, outboard gear lube, or marine gear oil — these specialized fluids ensure smooth shifting, clean seals, and maximum efficiency under load.

Why Marine Gear Lube Matters

  • Extreme Pressure Protection: Shields gears and bearings from metal-to-metal wear.
  • Water Resistance: Marine formulas prevent emulsification and gear corrosion.
  • Thermal Stability: Maintains viscosity under high RPM and temperature.
  • Seal Compatibility: Safe for all OEM lower-unit seals and materials.

Types of Marine Gear Lubes

Type Best For Key Benefits
Standard 80W-90 Gear Lube Most outboards & sterndrives OEM-approved viscosity, excellent corrosion resistance
High-Performance Synthetic High-RPM or racing boats Extended drain intervals, superior film strength
Premium Marine Gear Oil Saltwater & heavy-duty use Enhanced anti-foam, anti-wear, and water separation

Choosing the Right Gear Lube

Follow your engine manufacturer’s recommendation for viscosity and certification. Many Mercury, Yamaha, and Volvo Penta units require specific formulations such as SAE 80W-90 API GL-5 or synthetic gear oil for heavy-duty applications. Always replace drain-plug gaskets during service and check for water contamination (milky color).

Reminder

Change marine gear lube every 100 hours or at least once per season. Inspect drain plugs for metal shavings and ensure the oil is clear. Use a lower-unit pump for clean, complete refills without trapped air pockets.

Frequently Asked Questions

Can I use automotive gear oil in my outboard?
No — automotive gear oil lacks the marine corrosion inhibitors and water-separation properties required for boat lower units. Always use marine-rated gear lube.
How often should I replace my lower unit oil?
Replace it every 100 engine hours or at least annually, and immediately if you notice milky or cloudy oil (a sign of water intrusion).
Is synthetic gear lube better?
Synthetic marine gear oil resists heat and pressure better than conventional oils and extends change intervals, especially for high-performance boats.
What’s the correct viscosity for my engine?
Most outboards use SAE 80W-90 API GL-5, but some sterndrives and high-output engines specify synthetic 75W-90. Check your owner’s manual for OEM requirements.

Why Buy Marine Gear Lube from The Outdoor Warehouse?

  • OEM-approved gear lubes for Mercury, Yamaha, Evinrude, Volvo Penta, and Suzuki.
  • Full line of synthetic and conventional marine gear oils.
  • All products meet or exceed API GL-5 and NMMA FC-W standards.
  • Fast U.S. shipping and expert marine support.

Shop Marine Gear Lube & Lower Unit Oil at The Outdoor Warehouse — performance-tested protection for outboards and sterndrives.

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