Direct Injection Engine Oil is recommended for use in DFI Mercury, Mariner, Optimax outboards and DFI two-cycle engines. A synthetic blend 2-stroke engine oil specifically formulated and developed to meet the needs of OptiMax and Direct Fuel Injected (DFI) 2-stroke outboard engines. Provides the maximum protection for OptiMax and DFI engines even under the most extreme operating conditions. Outperforms other oils by combining a carefully modified base stock blend with a synthetic additive package. Minimizes carbon build-up to help maintain engine top-end speed and acceleration. Superior lubrication for increased resistance to piston scuffing. Will mix with other two-stroke engine oils.