Sierra 25W-40 oil for Mercruiser engine. This 4-cycle oil is blended with premium-grade synthetic and mineral-based stock, plus superior designed additives formulated for the stress endured by sterndrive and inboard engines. Superior corrosion protection. Advanced lubrication reduces wear. Removes thermal breakdown under high RPMs and extreme temperatures and loads. 55 gallons. Sierra Part #18-9440-7P.
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