Specifically formulated and developed to meet the needs of: All 4-stroke outboard engines. - Developed for the rigors of the marine environment. - Industry-leading corrosion protection. - Features premium-grade synthetic and mineral-based stocks with specially designed marine grade additives not required in automotive oils. - Outstanding lubricity for internal engine components to reduce wear, scuffing and scoring. - Excellent running quality and long-term reliability. - Rigorously tested to guarantee warranty protection for Mercury and Mariner 4- Stroke outboards.