It is sutiable for 4 seasons. Ready to Use, combines the excellent temperature and corrosion protection of GabcHems Blue AntiFreeze with de-mineralized water to help reduce the risk of cooling system deposits. Helps to prevent rust and corrosion. A patented organic acid corrosion inhibitor package to provide extended engine protection against rust and corrosion. It does not cause bubbles. It Can be used in all cooling systems, including aluminum radiators. It prevents calcification.