Pennzoil motor oil 30 mono-grade from the maker of the leading motor oil in America, an advanced proprietary conventional formula with Active Cleansing Agents. Not only helps prevent dirt and contaminants from turning into performance robbing deposits, but also cleans out sludge. Because at Pennzoil we know, a cleaner engine is better protected and responsive. Mono-grade oils are suitable for use in engines fueled with gasoline or LPG that require SAE 30 or SAE 40 viscosity grades.