Pentofrost A4 is a pre-diluted antifreeze for Asian vehicle applications in water-cooled engines. It contains phosphates and organic salts to protect all materials used in cooling systems. Pentofrost A4 does not contain any silicate, borate, nitrite or amine additives since these may harm your vehicle. Do not mix with other coolants (especially silicated coolants), as this may cause gel formation and clog your radiator.