Pennzoil heavty duty marine engine oil is specifically forumulated to provide excellent wear protection for marine diesel and 4-cycle inboard/outboard gasoline engines. High viscosity and film strength protect in high speed/ high load marine applications. Pennzoil marine oil minimizes carbon deposits, ring wear, and cylinder bore polishing. The result equals less oil consumption. Acid neutralizing additives help to reduce corrosive wear. Offered in grades SAE 30, SAE 40, and SAE 15W-40.
Pennzoil Marine products are what I use because I get good results. Over the years I have have used the no name stuff and had problems. No problems with Pennzoil.