Yamaha - 10W30 Marine Full Synthetic Oil - Quart - QBL-10W30-FS-12 - 12 Pack. Protect your Yamaha outboard with a full synthetic marine oil designed for real-world, on-the-water performance. Yamaha 10W30 Marine Full Synthetic Oil helps maintain consistent lubrication under heat and load, supports cleaner engine operation, and provides enhanced corrosion protection in humid and saltwater environments. It's a dependable option for routine maintenance when you want smooth operation and long-lasting protection from start-up through shut-down.. Key Features. Viscosity: 10W-30. Type: Marine full synthetic outboard engine oil. Formulated to help protect against wear during high RPM operation. Helps resist thermal breakdown in elevated operating temperatures. Marine-grade corrosion protection for storage and harsh conditions. Supports cleaner internals by helping reduce sludge and deposits. Bottle Size: 1 quart (12 Pack). OEM Part Number: QBL-10W30-FS-12. Yamalube 10W-30 full synthetic is reco