Comma's Ready-to-Use Antifreeze is a pre-mixed, ethylene glycol-based solution with sophisticated silicate inhibitors. It's designed to shield your engine from rust, excess heat, and ice. Expect a reliable performance for up to 5 years, and it's also formulated with a bittering agent to discourage accidental ingestion. This antifreeze and coolant protects against corrosion, overheating and freezing and has a typical service life of up to 3 years. It is safeguarded with a bittering agent to help avoid accidental ingestion.