MERCURY 10W-30 4-Stroke Marine Engine Oil Quart — FC-W Certified, Mineral Base for Outboards

MERCURY 10W-30 4-Stroke Mineral Marine Engine Oil (1 qt) is a mineral-based lubricant engineered to protect four-stroke outboards from wear and corrosion both on and off the water.

Marine engines face salt, humidity, temperature swings and intermittent operation that ordinary automotive oils aren't formulated to handle. This Mercury oil uses a mineral base with a marine-specific additive package to resist rust, reduce wear and maintain viscosity under load. It is FC-W and FC-W Catalyst Compatible certified and is produced to Mercury Marine original equipment specifications, making it suitable wherever a 10W-30 four-stroke marine oil is recommended.

How does this oil protect marine engines differently than car oil?

The formulation contains corrosion inhibitors and detergents tuned for marine exposure, plus additives that support stability during the frequent on/off cycles typical of boat use. Those tweaks reduce internal corrosion and help keep moving parts clean, which improves reliability over time.

• Corrosion inhibitors to protect metal surfaces in humid or salty air
• Detergents and dispersants to prevent deposit buildup
• Viscosity retention to maintain film strength under marine loads
• Mineral base tailored for four-stroke marine engine demands

When should I use MERCURY 10W-30 instead of another viscosity?

Use this 10W-30 grade when your engine manufacturer specifies 10W-30 for the expected operating temperatures and conditions. It matches the performance needs of many four-stroke outboards and fits warranty requirements for engines calling for this viscosity.

• Follow your engine owner’s manual viscosity recommendation
• Choose 10W-30 for moderate temperature ranges and typical boating seasons
• Opt for this product when FC-W certification is required
• Suitable for Mercury and other brands that accept mineral 10W-30

What certifications and manufacturer standards does this product meet?

This oil exceeds marine industry expectations for four-stroke engine service and carries FC-W and FC-W Catalyst Compatible certifications. It is manufactured to Mercury Marine’s original equipment specifications, supporting warranty and performance claims when used as directed.

• FC-W certified for four-stroke marine use
• FC-W Catalyst Compatible for catalyst-equipped engines
• Produced to Mercury Marine OEM specifications
• Meets manufacturer requirements where 10W-30 is specified

How does this quart-sized bottle fit into routine maintenance?

The 1-quart container is convenient for single oil changes on smaller four-stroke outboards, topping off oil between drains, or carrying aboard as a spare. Its size is easy to store in a toolbox or boat locker and reduces waste compared with larger, less portable containers.

• One-quart bottle for single drain or top-off tasks
• Compact for onboard storage and emergency spares
• Easy to pour and measure for accurate fills
• Reduces product waste for infrequent use boats

Who is this for: Boaters and marine technicians who operate or service four-stroke outboard engines and need a reliable, OEM-grade mineral oil in 10W-30 viscosity. It’s ideal for owners who require FC-W certified lubrication, anglers and weekend boaters seeking corrosion protection and shops that stock Mercury-approved fluids for maintenance and warranty compliance.