Quicksilver 80W-90 Marine Gear Lube, 32 oz (Pack of 6) — Premium Corrosion & Water-Resistant Protection

Quicksilver 80W-90 Premium Gear Lube is a marine-grade gear oil formulated to protect outboard lower units and gear cases (recommended for applications under 75hp) from wear, corrosion, and water-related damage.

Designed and tested to meet Mercury Marine OEM specifications, this 32 oz bottle of 80W-90 premium gear lube delivers dependable lubrication and corrosion resistance for outboard motors. It is engineered to help prevent failure when water enters the gear housing and to extend gear life under typical marine conditions. Sold in a pack of six, the formula is targeted at smaller outboards where reliability and proper viscosity are critical for smooth operation.

How does this gear lube protect lower units from corrosion and pitting?

The formulation includes corrosion inhibitors and anti-wear additives that cling to gear surfaces and form a protective film, reducing metal-to-metal contact and limiting rust and pitting when moisture is present. Extensive marine testing verifies its resistance to saltwater and freshwater exposure typical of boating environments.

• Contains corrosion inhibitors that reduce oxidation on internal components
• Anti-wear additives lower friction under load
• Tested for water intrusion scenarios common to lower units
• Meets Mercury Marine OEM protection standards

Is this the right viscosity and fit for my small outboard?

Yes — the 80W-90 viscosity is recommended for many outboard gear cases and lower units, especially in applications under 75 horsepower. It balances thickness for pressure protection with flowability at operating temperatures so gears stay lubricated without excess drag.

• 80W-90 viscosity suitable for most small outboards
• Specified for gear cases below 75 hp
• Direct replacement for Mercury Marine 858058K01
• Supplied in convenient 32 oz bottles (pack of 6)

What happens if water enters the gear housing — will this oil help?

This premium gear lube contains additives designed to maintain gear protection even after limited water intrusion. While preventing all water entry is best practice, the formula helps limit damage and reduce the risk of corrosion-related failures should water reach internal parts.

• Additives help protect gears during temporary water exposure
• Formulated to reduce wear and pitting caused by moisture
• Extensively tested for marine-specific contamination scenarios
• Provides extra defense compared with standard automotive gear oils

How do I use and store Quicksilver 80W-90 gear lube?

Use this oil to fill or top up outboard lower units according to your engine manufacturer’s capacity and service intervals. Store bottles upright in a cool, dry place away from direct sunlight and seal tightly to avoid contamination.

• Follow your outboard’s service manual for fill volumes and procedures
• Replace lower unit seals and drain plugs as recommended when servicing
• Keep containers sealed and store off the deck to prevent spills
• Pack of six 32 oz bottles gives spares for seasonal maintenance

Who is this for? Boaters, marine mechanics, and service shops running outboards under 75 hp who need Mercury Marine OEM-level protection will benefit from Quicksilver 80W-90 Premium Gear Lube. It’s ideal for owners who prioritize long-term gear life, reliable corrosion resistance, and a product developed specifically for marine conditions by a brand with decades of industry experience.