Sierra 18-9440-4 25W-40 Synthetic Blend Marine Engine Oil 5 Quart

Sierra 18-9440-4 is a premium 25W-40 synthetic blend marine engine oil specifically formulated for the demanding conditions of sterndrive and inboard engines. This advanced 4-cycle oil combines high-quality synthetic and mineral base stocks with specialized marine additives designed to withstand the unique stresses of marine environments.

Key Features:

• Superior corrosion protection against saltwater and moisture exposure
• Advanced lubrication technology reduces wear on critical internal engine components
• Outstanding friction reduction for improved engine efficiency and longevity
• Resists thermal breakdown even under high RPMs, extreme temperatures, and heavy loads
• Extensively tested to ensure reliable performance in marine applications
• 5-quart container capacity

This synthetic blend formulation provides the perfect balance of protection and performance for recreational and commercial marine engines. The 25W-40 viscosity grade offers excellent flow characteristics for reliable cold starts while maintaining protective film strength at operating temperatures. Sold in case packs only.