Bluecol ‘U' Top-Up Anti-Freeze - 1L Bluecol ‘U' is a universal anti-freeze and engine coolant suitable for use in all vehicle types. It can be mixed with any anti-freeze already in the cooling system to help provide year-round protection, offering superior corrosion and rust resistance. Rust resistance up to 5 years Ready-mixed with de-ionised water Conforms to British Standard BS6580