Pennzoil 550022734 15W-40 4-Cycle Heavy Duty Marine Engine Oil - 1 Gallon Formulated to keep your marine engine running clean Designed for outboard motors Mixes easily with fuel for premix applications Excellent flow properties for oil injection systems Keep performance-robbing carbon deposits from forming in the combustion chamber, piston tops and under crowns and piston-combustion rings Formulated to keep your marine engine running clean Oil weight: 15W-40 Guard against harmful engine deposits Protect against piston-scuffing Keep performance-robbing carbon deposits from forming in the combustion chamber, piston tops and under crowns and piston-combustion rings