Prestone Command® Heavy-Duty Extended Service Interval (ESI) SCA Pre-Charged Antifreeze/Coolant (AF/C) is designed to help protect heavy-duty cooling systems on on- and off-road vehicles in the most demanding conditions, including extreme cold and heat. The blend of ethylene glycol and inhibitors is compatible with conventional heavy-duty AF/C and all filter technologies, in a formula intended to eliminate the initial SCA (supplemental coolant additive) precharge on new vehicles and recharged systems. The ready-to-use 50/50 formulation is convenient for topping off. Antifreeze Coolant, 1 gal., 50/50