Pennzoil 3871-12PK Marine Premium Plus Outboard 2 Cycle (TC-W3)  1 Quart  (Pack of 12) Formulated to keep your marine engine running clean Designed for outboard motors 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