The Mercury(R) Quicksilver(R) 4-Cycle 25W-40 Engine Oil is for heavy duty use, providing power and protection for 4-cycle inboard and outboard gas engines on your recreational boat. FEATURES: High-output sterndrive and inboard engines Multi-viscosity 25W-40 oil formulated to eliminate thermal breakdown (no viscosity improvers necessary) under extreme temperatures and loads Field-tested and proven in gas and diesel applications Provides superior lubrication and protection of internal components from corrosion, wear scuffing and scoring - even in higher temperature engines Provides warranty protection for Mercury MerCruiser engines Model: 8M0078619