MERCURY 10W-30 Marine Engine Oil 1 Gallon — FC-W Certified Mineral Formula for Corrosion & Wear Protection

MERCURY 10W-30 4‑Stroke Mineral Marine Engine Oil is a one-gallon, FC‑W certified mineral lubricant formulated to protect four‑stroke outboard and inboard marine engines from wear and corrosion on and off the water.

Marine powerplants face salt, humidity, and long idle periods that standard automotive oils are not engineered to withstand. This Mercury-branded 10W‑30 mineral oil uses a tailored additive package and stable base stocks to meet marine-specific demands, offering manufacturer-level protection and compatibility for engines that specify 10W‑30. It’s produced to Mercury’s OEM specifications and is certified FC‑W and FC‑W Catalyst Compatible, ensuring it meets industry performance and warranty requirements.

Why choose a marine-specific 10W‑30 instead of automotive oil?

Marine oils are developed to address corrosion, water contamination, and the unique thermal cycles of boat engines. Automotive oils lack many of the rust inhibitors and anti-foaming additives needed for marine environments, so using a marine-formulated lubricant reduces the risk of damage and service issues.

• Contains anti-corrosion additives tailored for salt and freshwater exposure
• Formulated to resist viscosity breakdown under marine operating loads
• FC‑W certification confirms marine performance standards

How does this oil protect engine components during long idle and heavy load use?

The additive system provides strong film strength to minimize metal-to-metal contact during heavy throttle and prolonged low-speed operation. It also helps maintain stable viscosity across a range of temperatures so bearings, cams, and pistons remain protected in variable marine conditions.

• Excellent wear protection for bearings and valve train
• Viscosity retention to preserve oil film under stress
• Anti-foaming and dispersant properties to keep surfaces clean

Is MERCURY 10W‑30 compatible with other four‑stroke marine engines?

Yes — this mineral oil is suitable for Mercury and many other leading four‑stroke marine engines when 10W‑30 is specified by the manufacturer. It meets the industry and OEM specifications required for warranty compliance and catalyst compatibility in applicable systems.

• Meets FC‑W and FC‑W Catalyst Compatible standards
• Suitable wherever a 10W‑30 mineral oil is recommended
• Produced to original equipment manufacturer quality controls

How do I use and store this one‑gallon container safely?

Use the oil during routine service intervals or top-offs per your engine manual. Store the sealed one-gallon jug upright in a cool, dry place away from direct sunlight and extreme temperatures to preserve additives and prevent contamination.

• Follow engine manufacturer oil-change intervals
• Keep container sealed when not in use to avoid moisture ingress
• Dispose of used oil responsibly at a certified recycling facility

Who this product is for: Boaters, professional marine technicians, and recreational anglers who operate four‑stroke outboard or inboard engines requiring 10W‑30 mineral oil will benefit from this Mercury formulation. It’s ideal for owners seeking OEM-grade protection, corrosion resistance for saltwater and freshwater use, and a product that supports manufacturer warranty and catalyst compatibility. Choose this one-gallon MERCURY oil when you want a proven, marine-specific lubricant engineered for the stresses of boating rather than a general automotive product.