Quicksilver® SAE 10W-30 Synthetic Blend 4-Stroke Marine Engine Oil will have your boat's engine cutting waves with the smoothest-running performance you've ever experienced. Specifically designed to keep your 4-cycle outboard, sterndrive, or inboard engine running like a charm. Quicksilver delivers superior corrosion protection, which helps lengthens the life of your engine. Not only is it FC-W certified, Quicksilver SAE 10W-30 Synthetic Blend 4-Stroke Marine Engine Oil is the most recommended OEM marine engine oil around. Ideal for use in all four stroke outboards to 150hp, 3.4L V6 outboards, and 4.6L V8 outboards.  Delivers high-end, smooth-running engine performance. Designed for 4-cycle outboards, sterndrives, and inboard engines. Most-recommended OEM marine engine oil. Superior corrosion protection. FC-W certified.