Quicksilver SAE 90 Gear Lube for Outboards & Sterndrives, 32 oz — High-Pressure, Corrosion-Resistant

Quicksilver SAE 90 High Performance Gear Lube is a 32 oz lower-unit oil formulated to shield outboard and sterndrive gears from corrosion, wear and water-related failures.

Maintaining clean, purpose-built gear oil is critical for prolonging lower-unit life and preserving smooth, reliable power delivery. This Quicksilver SAE 90 formula is engineered specifically for marine lower units — sterndrives and outboards above 75 hp — combining SAE 90 viscosity with extreme-pressure additives to reduce metal-to-metal contact and defend against corrosion when water intrusion occurs. The 32-ounce bottle makes routine service straightforward and matches factory specifications for many Mercury Marine and other original-equipment applications.

How does this gear lube protect gears during heavy use?

The formulation contains extreme-pressure synthetic additives that cling to gear surfaces to prevent direct metal contact under load. That film reduces wear during high-torque shifts and repeated gear engagements, helping components last longer and maintain smoother operation.

• SAE 90 viscosity for consistent film strength under load
• Extreme-pressure chemistry to minimize metal-to-metal abrasion
• Corrosion inhibitors to protect internal surfaces from salt and fresh water
• Compatible with sterndrive and outboard lower unit materials

Will this oil help if water gets into the gear housing?

This Quicksilver gear lube is formulated to resist the damaging effects of water intrusion by maintaining protective additives and reducing corrosive attack. While no oil can entirely eliminate mechanical damage from large-scale flooding, this product helps prevent rapid degradation and reduces the risk of premature failures when small amounts of water contaminate the gearcase.

• Anti-corrosion agents that slow rust and pitting
• Stable additive package to retain protection in wet conditions
• Helps preserve bearings, shafts and gear teeth performance

Is this suitable for my boat’s lower unit and what size engines is it for?

Quicksilver SAE 90 High Performance Gear Lube is intended for use in lower units of outboard motors and sterndrives, particularly applications rated above 75 horsepower. Always cross-check your owner’s manual or OEM part recommendations, and use the manufacturer part number 8M0222065 to confirm compatibility.

• Designed for sterndrives and outboards above 75 hp
• OEM-grade specification and part number 8M0222065
• Matches viscosity expectations for many factory lower units

How do I use this 32 oz bottle during routine maintenance?

The 32-ounce size typically covers a single lower-unit service for many outboards and sterndrives, making it easy to drain and refill during scheduled maintenance. Follow standard service steps: warm the oil for better flow, drain fully, inspect for metal particles, then refill to the level specified by your manufacturer.

• 32 oz capacity suitable for standard refill quantities
• Use when lower unit is warm for complete drainage
• Inspect drained oil for metal or water to catch early issues

Who this is for: This Quicksilver SAE 90 High Performance Gear Lube 32 oz is aimed at boat owners, marine technicians and fleets who need an OEM-quality lower unit oil for outboards and sterndrives above 75 hp. If you follow manufacturer service intervals, want a product designed and tested for marine conditions, and prefer an oil backed by Quicksilver’s long-standing marine heritage, this formulation delivers a practical balance of protection and compatibility for routine lower-unit maintenance.