HALF-CASE, 2x Gallons ECSTAR V7000 Semi-Synthetic 10W40 Marine Engine Oil is a proprietary blend of premium minneral oils and synthetic lubricants, with an additive profile designed to stand up to harsh conditions on-the-water. - Advanced detergents keep internal engine parts clean - Higher quality base oils improve fuel economy and help engines start easily in cold weather - Special additives to help protect engines in both salt and fresh water environments - FC-W Certification by the NMMA - Replaces 990C0-10W40