Mercury Optimax /DFI 2-Cycle Outboard Oil 1 Gallon 92-858037K01 Mercury Optimax/DFI oil is recommended for use in Mercury and Mariner Optimax and direct fuel injected DFI 2-cycle outboards Maximizes the performance of Mercury and Mariner Optimax and DFI engines where reduced oiling rates and higher operating temperatures put increased demands on lubricants Synthetic additives provide increased lubricity and resistance to scuffing