Silicate, Borate, Nitrite and Amine Free; Compatible with other similarly formulated OAT coolants; Do not mix with conventional high pH, borate or silicate based Coolants. WARNING: This product can expose you to chemicals including Lead and lead compounds, which is known to the State of California to cause cancer and birth defects or other reproductive harm. (6) Coolant/Antifreeze and (1) Radiator. Compatible with the following vehicles. 90-93 C1500 (submodel: 454 SS, Cheyenne, Silverado, WT).