Sinopec FD-2 Green SCA 50/50 Antifreeze & Coolant, 55 gallon drum is a Fully Formulated, ethylene glycol-based coolant, precharged with advanced technology Supplemental Coolant Additives (SCAs). Because it is SCA precharged, it requires no SCAs at initial fill and ensures proper chemistry at every top-off. Fleet Charge SCA 50/50 Antifreeze & Coolant, 55 gallon drum uses a low silicate and phosphate-free formulation. This product also has the following benefits: Works in ALL heavy-duty diesel, gasoline and natural gas engine cooling systems. Optimum protection against freezing and boil over. Provides corrosion protection of all cooling system metals and components. Incorporates nitrite to provide wet sleeve liner protection against cavitation. Designed to last the life of the engine when maintained with a high quality SCA filter system. Eliminates SCA mixing errors at initial fill. Phosphate free formula reduces the risk of scale.