Quicksilver Marine® Heavy Duty Engine Oil provides outstanding protection for 4-cycle inboard/outboard gasoline engines in marine environments.
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.