Prime Guard QUIK78619 25W-40 4-Stroke Marine Engine Oil, 1 Quart

The Prime Guard QUIK78619 is a SAE 25W-40 mineral 4-stroke marine engine oil sold in a convenient 1-quart (32 fl oz) bottle. It is a direct replacement for OEM part number 8M0078619, meeting or exceeding the original manufacturer specifications for marine 4-stroke engine lubrication.

Marine engines face unique challenges that automotive oils simply aren't designed to handle. This oil is specially formulated to deliver reliable protection in the demanding saltwater and freshwater environments where marine engines operate.

Key Features:

• Multi-viscosity 25W-40 formula engineered to eliminate thermal breakdown under extreme temperatures and heavy loads — without relying on viscosity-improving additives
• FC-W and FC-W Catalyst Compatible certified — exceeds all marine industry 4-stroke oil requirements
• Protects internal engine components against corrosion, wear, scuffing, and scoring, even under elevated operating temperatures
• Approved for use in outboard, sterndrive (I/O), inboard, MerCruiser, and high-performance marine engines where 25W-40 oil is specified
• Field-tested and proven in both gas and diesel marine engine applications
• Helps extend engine life by reducing friction and preventing damage to internal components

Cross-references OEM part number 8M0078619 (also sold as 92-8M0078619). Packaged in a 946 ml (32 fl oz) / 1-quart plastic bottle.