Mercury® Marine OptiMax DFI 2-Stroke Outboard Engine Oil provides the best protection in all 2-stroke applications, including Mercury and Mariner® OptiMax and direct-fuel-injected (DFI) 2-stroke outboards. Mercury Marine OptiMax DFI 2-Cycle Outboard Engine Oil 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. With a carefully modified base stock blend and a maximized additive system, this Mercury Marine oil will provide industry-leading wear and corrosion protection; minimize carbon buildup that can affect your outboard's top speed and acceleration; help to maintain peak engine performance and fuel economy; and help to reduce smoke. Mercury OptiMax DFI boat oil provides warranty protection for al Mercury and Mariner OptiMax and DFI outboards and Jet Drive and Sport Jet® DFI engines.