YAMAHA Yamalube Marine Lower Unit Gearcase Lube — 1 Quart with Pump & Gasket, OEM Corrosion Protection

Yamalube Marine Lower Unit Gearcase Lube (1 quart) with pump and gasket is Yamaha's OEM formula for protecting outboard gearcases from wear, rust, and corrosion in both fresh and saltwater.

Designed and manufactured for Yamaha outboards up to 250 HP (excluding the Yamaha 4.2L V6), this lower-unit gearcase lubricant combines high-shear stability with fortified rust and corrosion inhibitors to keep gears and bearings operating smoothly under high-speed, extended-use conditions. The package includes a one-quart bottle of Yamalube, two washers, an Atwood-style pump for easier filling, and the necessary gasket for a proper seal—everything you need for routine lower-unit service and preventive maintenance.

How does this gearcase lube protect my lower unit during long runs?

The formula is engineered for continuous high-speed operation, maintaining a protective film on gears and bearings to reduce friction and metal-to-metal contact. Enhanced corrosion inhibitors work actively to resist oxidation and saltwater attack, extending component life without compromising viscosity under heat.

• Stable film strength reduces gear wear during sustained high RPM use
• Rust and corrosion inhibitors protect internal metal surfaces
• Maintains proper viscosity across a broad temperature range
• OEM formulation tuned for Yamaha lower-unit tolerances

Is this lubricant compatible with my outboard and how do I apply it?

Yamalube Marine Lower Unit Gearcase Lube is specified for use in Yamaha outboards up to 250 HP, with the exception of the 4.2L V6 model. The included Atwood pump simplifies filling and reduces spills, while the washers and gasket help ensure a secure, leak-free installation when servicing the drain and fill points.

• Suitable for Yamaha outboards 250 HP and below (not for 4.2L V6)
• Comes with an Atwood pump for clean, controlled filling
• Includes two washers and a gasket for correct sealing
• Follow manufacturer's service intervals and disposal guidelines

What performance benefits can I expect from using the OEM Yamalube product?

Using Yamaha’s OEM gearcase lube helps maintain factory-intended protection, fit, and performance. The lube reduces the likelihood of premature wear, helps prevent pitting and corrosion from salt exposure, and supports smooth shifting and quieter gear operation over time.

• Extended component life through reduced wear and scoring
• Improved corrosion resistance for saltwater use
• Less gear noise and better shifting due to consistent lubrication
• OEM specification reduces risk of compatibility issues

What should I know about storage, handling, and disposal?

Store the bottle upright in a cool, dry place away from direct sunlight and extreme heat. Use the provided pump to minimize spills and wipe any drips immediately; dispose of used lubricant per local regulations for petroleum-based fluids to protect the environment.

• Keep container sealed and stored at moderate temperatures
• Use included pump to control dispensing and reduce waste
• Collect and discard used lube following local hazardous-waste rules
• Replace washers and gasket during service for proper sealing

Who is this for? Boaters, fishing professionals, and DIY marine technicians who own Yamaha outboards (up to 250 HP) and want a factory-formulated lubricant for routine lower-unit maintenance will benefit most. If you prioritize OEM compatibility, corrosion protection in saltwater environments, and a cleaner, easier fill process with included hardware, this Yamalube gearcase lube kit is designed to meet those needs without guesswork.