Peak, Gallon, Full Strength Concentrate Antifreeze, 10 Times More Scale Fighting Inhibitors, Compatible For Use In All Automobiles & Light Duty Trucks, Mixes With Any Color Antifreeze, Provides 150,000 Miles Or 5 Years Of Protection When A Complete Cooling System Flush & Fill Is Performed, Features A Phosphate Free & Silicate Free Formula, Meets ASTM D-3306 & ASTM D-4340, Color Is Yellow.