Fogging Oil Inboard & Outboard Engine Boat Marine Auto Winterizing Storage, Star Brite , 12-Ounce Prevents corrosion for storing & winterizing engines Prevents corrosion when storing inboard or outboard engines for an extended period of time. . Special formula makes starting engine after storage quick and easy 12oz We Recommend Taping the Extension Tube to Sprayer so it doesnt shoot off into cylinder when spraying as a precaution!