Penrite Engine Flush Additive is a solvent free, engine cleaning formulation that removes engine deposits, sludge and contaminants with the oil service drain. It contains added zinc for engine wear protection and its fast acting formulation works in 10 minutes. The solvent free formulation protects gaskets and seals from damage during the cleaning process. It is designed for use in all engine types in passenger cars, 4WD's, light and heavy duty commercial vehicles, motorcycles, farming, mining, agricultural, industrial equipment, marine and stationary engines.