Quicksilver 10W-30 4-Stroke Synthetic Marine Engine Oil — 1 Quart, Corrosion & Wear Protection

This Quicksilver 10W-30 oil is engineered for marine four-stroke engines up to 150 hp and selected V6 and V8 outboards, offering stable viscosity, shear strength and corrosion protection in a one-quart package. Backed by the Quicksilver name—trusted by Mercury Marine and other OEMs for decades—this formula meets demanding marine environment needs like salt spray, high load and variable temperatures. Use it when your service manual specifies SAE 10W-30 or the manufacturer part number 8M0142135.

What engines is this 10W-30 oil suitable for?

This product is intended for four-stroke marine outboards, plus many inboard and sterndrive engines where SAE 10W-30 is recommended. It covers outboards up to 150 hp and specific 3.4L V6 and 4.6L V8 Mercury engines, but always check your owner’s manual for exact fitment.

• Recommended for all 4-stroke outboards through 150 hp
• Compatible with certain 3.4L V6 and 4.6L V8 outboards
• Appropriate for many inboard and sterndrive systems requiring 10W-30
• Manufacturer part number: 8M0142135 for cross-reference

How does this oil protect marine engines from wear and corrosion?

The synthetic blend is formulated to maintain stable viscosity under load and resist breakdown, which helps protect bearings, cams and other components. Corrosion inhibitors in the blend defend metal surfaces from saltwater and humid conditions that are common in marine environments.

• High shear strength preserves film under heavy loads
• Viscosity retention helps reduce metal-to-metal contact
• Corrosion inhibitors guard internal surfaces from salt and moisture
• Designed to meet or exceed OEM warranty requirements

When should I change to or use this Quicksilver oil?

Follow the maintenance interval specified in your engine’s owner or service manual; this oil is suitable wherever the manual calls for SAE 10W-30 synthetic blend. Change intervals vary by engine type, hours of operation and operating conditions such as heavy load or extreme heat.

• Use if your manual lists SAE 10W-30 or part 8M0142135
• Replace based on manufacturer-recommended service schedule
• Consider more frequent changes for high-load or saltwater use
• Always inspect oil condition and level before outings

Are there any installation or compatibility notes I should know?

Always clean the fill area and use a proper funnel to avoid contamination when adding oil. This product is formulated for marine use, but you should confirm compatibility with non-Mercury engines by checking OEM specifications.

• Refer to the owner/service manual for exact requirements
• Use a fresh seal on the oil fill cap when applicable
• Dispose of used oil responsibly per local regulations
• Store closed container away from direct heat and sunlight

Who is this for? Boaters, professional technicians and marine service shops that need a reliable, OEM-aligned 10W-30 oil for four-stroke outboards, inboards and sterndrives will benefit from Quicksilver’s synthetic blend. It’s especially useful for owners of Mercury-powered craft seeking a product that aligns with factory specifications, as well as anyone who wants robust wear and corrosion protection in a compact one-quart bottle.