Quicksilver 4-Stroke Marine Engine Oil 10W-30 - Specifically formulated for use with all 4-stroke outboards. A premium-grade base stock and special additives make this superior grade of 4-stroke outboard oil. Meets API service requirements of SJ, CF-2, CH-4. Contains significantly more performance additives than automotive oils to stand up to the rigors of the 4-stroke outboard environment, and special viscosity improvers to assure stay-in-grade performance in high RPM 4-stroke outboard.