Prime Guard QUIK78620 SAE 25W-40 4-Stroke Marine Engine Oil, 1 Gallon

Prime Guard QUIK78620 is a SAE 25W-40 4-Stroke Marine Engine Oil supplied in a convenient 1-gallon container. Cross-referencing Mercury Marine / Quicksilver part number 8M0078620 (also listed as 92-8M0078620), this conventional marine oil is purpose-built for the demanding conditions found in 4-stroke marine powerplants — where automotive oils simply fall short.

Key Features:

• Marine-Specific Formulation: A specialized additive package outperforms automotive oils by addressing the unique challenges of salt air, humidity, and continuous high-RPM operation.
• Broad 4-Stroke Compatibility: Approved for use in all 4-stroke outboard, sterndrive (MerCruiser), inboard, and high-performance marine engines where 25W-40 viscosity is specified.
• Superior Corrosion & Wear Protection: Industry-leading viscosity retention and strength help prevent corrosion and wear to extend engine life.
• Thermal Stability: Engineered to eliminate thermal breakdown under extreme RPM, temperature, and load conditions common in marine use.
• FC-W Certified & Catalyst Compatible: Exceeds all marine industry 4-stroke oil requirements, including FC-W and FC-W Catalyst Compatible certification — safe for use in engines with or without catalytic converters.
• Emissions System Safe: Will not damage emissions systems, making it suitable for the latest generation of clean-running marine engines.
• Clean Oil Technology: Helps reduce friction and prevents deposit buildup on internal components for long-term engine reliability.

Cross-Reference Part Numbers: 8M0078620 | 92-8M0078620

This 1-gallon jug of SAE 25W-40 marine engine oil is the ideal choice for boaters who demand factory-recommended protection for their outboard, sterndrive, or inboard 4-stroke engine.