For Improved Efficiency & Longer Engine Life FPPF 4000 CST is a concentrate utilizing today's technology to create a combination corrosion inhibitor and scale dispersant specifically designed to maintain heat transfer in all closed cooling systems. This product contains anionic polymers, surfactants, molybdenum and more to provide protection to all types of metals, including aluminum. By removing the existing scale, eliminating foaming, and reducing cavitation, 4000 CST improves the efficiency, decreases the potential for overheating and extends the engine life. Safety and Quality It is non-toxic, non-corrosive, and will not affect gaskets and hoses. Our quality cooling system treatment is compatible with all types of antifreeze including Glyclean.