Castrol Radicool SF Premix is a long-life, monoethylene glycol-based coolant with advanced organic acid inhibitor technology. It provides excellent corrosion protection for engines with cast iron, aluminium, copper or combinations of these metals. Radicool SF Premix prevents scale buildup, improves heat transfer, and extends drain intervals up to 3 years, reducing costs and environmental impact. It also contains a bittering agent for safety.