Quicksilver 25W50 Synthehtic Blend 4-Stroke Oil is recommended for Mercury Verado and all other high performance marine engines.Often used in marine racing engines, this synthetic blend oil outperforms automotive oils in marine applications because of its specialized additive package designed for marine engines. Continued use of this oil will provide outstanding wear and corrosion protection, which help extend engine life, minimize performance-robbing carbon deposits, maintain peak engine performance and reliability, and reduce oil consumption. Meets all sterndrive and inboard manufacturers warranty requirements and recommendations for use of an FCWoil.Key FeaturesMaintains viscocity under the most extreme operating conditions produced by racing (High RPMs and temperatures) tow sports and fishing (alernating between periods of high RPMs and throttling down to low RPMs or idle.)Protects against varnish buildup and sludge formationExceeds the rust protection requirements for NMMA certification