The formulation is designed for both gasoline and diesel engines Its lower-silicate, reduced pH, phosphate free European technology protects all cooling system metals, including aluminum, from corrosion ZEREX G-05 is a nitrite containing coolant designed to protect diesel engine cylinder liners from cavitation. It contains deposit control additives for protection from hard water deposits and scale ZEREX G-05 contains a high quality defoamer system and will not harm hoses, plastics or original vehicle finishes For any product use or product technical questions call 1-800-TEAM-VAL Contains 30 – 50 ppm of denatonium benzoate as a bittering agent