Quicksilver – 80W-90 Premium Gear Lube | Outboards and Sterndrives | Marine Formula | 858058Q01

Overview

Every boater knows the sound of confidence — that smooth, low hum when your outboard shifts cleanly into gear. Quicksilver 80W-90 Premium Gear Lube is made for that exact moment. You don’t think about it while it’s working, but you’d sure notice if it wasn’t. This oil gives your lower unit the protection it deserves, keeping your gears running quiet, cool, and corrosion-free, even after long hours on the water. Whether you’re fishing the flats or easing back to the dock at dusk, it delivers that solid, steady feel every time you shift.

Key Features

• Provides maximum protection against gear wear, corrosion, and pitting
• Designed for outboard engines up to 75 horsepower
• Contains marine-grade additives that safeguard gears even if water enters the housing
• 80W-90 viscosity for stable lubrication across temperature ranges
• Available in a compact 8-ounce bottle for quick top-offs and maintenance
• Built to Mercury Marine OEM standards for lasting dependability

Engine & Boat Compatibility

• Ideal for Mercury and Mariner outboards under 75 HP
• Safe for small sterndrive and lower unit applications
• Commonly used in fishing boats, inflatables, and small cruisers
• Works seamlessly in saltwater or freshwater setups

Performance & Practical Benefits

There’s no worse feeling than hearing a grind or hesitation when you shift into gear — especially after a long run. This Quicksilver gear lube eliminates that worry. It forms a tough, protective film that clings to metal surfaces, even under heavy torque or extreme heat. That means smoother shifts, tighter engagement, and consistent performance over long stretches of use.

But what really makes this oil shine is its resilience in the face of water intrusion. If moisture ever gets into the gear housing, the emulsifiers step in, keeping the oil’s protective qualities intact while preventing internal rust or corrosion. You’ll notice how the gears stay quieter, how everything feels balanced, and how maintenance becomes more predictable.

It’s the small, unseen things — the way your engine sounds, how it responds — that remind you quality matters.

Why Buy OEM

When you go with Quicksilver, you’re not rolling the dice with generic oil — you’re choosing a product made by the same engineers who built your engine. Every bottle is tested under the same punishing marine conditions your boat faces, from salt spray to full-throttle acceleration.

Aftermarket oils may seem fine on paper, but few are proven in the water. Quicksilver Premium Gear Lube is the real deal — built for reliability, peace of mind, and protection you can feel with every shift.

FAQ Section

Q1: Which engines use Quicksilver 80W-90 Gear Lube 858058Q01?

It’s designed for Mercury and Mariner outboards under 75 horsepower and similar marine gearcases.

Q2: What makes it different from generic gear oil?

It’s formulated specifically for marine environments, with additives that protect even when water intrudes.

Q3: How do I confirm it’s the right oil?

Check your owner’s manual or confirm part number 858058Q01 — it’s the OEM standard.

Q4: Can it be used in saltwater?

Yes — it’s built for both saltwater and freshwater protection.

Q5: Is it easy to apply?

Absolutely. The small bottle makes top-offs simple, even while you’re at the dock.