Sierra SAE30 4-Stroke Synthetic Marine Oil Recommended for gasolinediesel inboard and stern drive engines. A special blend of synthetic base oil and a balanced additive system that exceeds the FC-W requirements for marine engine oil. Superior Engine Protection during startups, operation and storage Reduces friction and wear for extended engine life Longer lubrication effectiveness than mineral oils Reduces oil consumption and improves fuel economy Replaces Mallory 9-82361 OMC Stern Drive 775595