Fully synthetic straight 30 weight engine oil is formulated for inboard & stern drive marine engines.

• Sierra full synthetic inboard engine oil
• SAE 30
• 1 quart bottle
• Recommended for gasoline and diesel inboard and I/O engines
• Developed specifically for the marine environment and the high running stresses marine engines encounter
• Reduces friction and wear for long engine life
• Beter lubrication effectiveness for longer durations than mineral oils
• Reduces oil consumption and improves fuel economy
• Exceeds all FC-W requirements
• API-CF/SL